diff --git a/scripts/instantiate_bridge.ts b/scripts/instantiate_bridge.ts
index 7d5887ef61..1c8b91ecf4 100644
--- a/scripts/instantiate_bridge.ts
+++ b/scripts/instantiate_bridge.ts
@@ -78,12 +78,10 @@ export const instantiateBridge = (
   }
 
   const l2Network = l2Networks[l2NetworkID]
-  const l1Network = l1Networks[l2Network.partnerChainID]
+  const l1Network = l1Networks[l2Network.parentChainId]
 
   if (!l1Network) {
-    throw new Error(
-      `Unrecognised partner chain id: ${l2Network.partnerChainID}`
-    )
+    throw new Error(`Unrecognised parent chain id: ${l2Network.parentChainId}`)
   }
 
   const l1Rpc = (() => {
diff --git a/scripts/testSetup.ts b/scripts/testSetup.ts
index 5558054297..e53b06d0c4 100644
--- a/scripts/testSetup.ts
+++ b/scripts/testSetup.ts
@@ -22,10 +22,10 @@ import { Wallet } from '@ethersproject/wallet'
 import dotenv from 'dotenv'
 import { EthBridger, InboxTools, Erc20Bridger } from '../src'
 import {
-  L1Network,
-  L2Network,
-  getL1Network,
-  getL2Network,
+  ParentChain as L1Network,
+  ChildChain as L2Network,
+  getParentChain as getL1Network,
+  getChildChain as getL2Network,
   addCustomNetwork,
 } from '../src/lib/dataEntities/networks'
 import { Signer } from 'ethers'
@@ -104,7 +104,7 @@ export const getCustomNetworks = async (
     explorerUrl: '',
     isCustom: true,
     name: 'EthLocal',
-    partnerChainIDs: [l2NetworkInfo.chainId],
+    childChainIds: [l2NetworkInfo.chainId],
     isArbitrum: false,
   }
 
@@ -122,7 +122,7 @@ export const getCustomNetworks = async (
     isArbitrum: true,
     isCustom: true,
     name: 'ArbLocal',
-    partnerChainID: l1NetworkInfo.chainId,
+    parentChainId: l1NetworkInfo.chainId,
     retryableLifetimeSeconds: 7 * 24 * 60 * 60,
     nitroGenesisBlock: 0,
     nitroGenesisL1Block: 0,
@@ -171,8 +171,8 @@ export const setupNetworks = async (
   }
 
   addCustomNetwork({
-    customL1Network: l1Network,
-    customL2Network: l2Network,
+    customParentChain: l1Network,
+    customChildChain: l2Network,
   })
 
   // also register the weth gateway
@@ -244,8 +244,8 @@ export const testSetup = async (): Promise<{
         l2Network: L2Network
       }
       addCustomNetwork({
-        customL1Network: l1Network,
-        customL2Network: l2Network,
+        customParentChain: l1Network,
+        customChildChain: l2Network,
       })
       setL1Network = l1Network
       setL2Network = l2Network
diff --git a/src/index.ts b/src/index.ts
index 99056afc27..5b5ec58fad 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -43,12 +43,12 @@ export { L1ToL2MessageGasEstimator } from './lib/message/L1ToL2MessageGasEstimat
 export { argSerializerConstructor } from './lib/utils/byte_serialize_params'
 export { CallInput, MultiCaller } from './lib/utils/multicall'
 export {
-  L1Networks,
-  L2Networks,
-  L1Network,
-  L2Network,
-  getL1Network,
-  getL2Network,
+  ParentChains as L1Networks,
+  ChildChains as L2Networks,
+  ParentChain as L1Network,
+  ChildChain as L2Network,
+  getParentChain as getL1Network,
+  getChildChain as getL2Network,
   addCustomNetwork,
   addDefaultLocalNetwork,
 } from './lib/dataEntities/networks'
diff --git a/src/lib/assetBridger/assetBridger.ts b/src/lib/assetBridger/assetBridger.ts
index ea3f72162b..6895b8ecb3 100644
--- a/src/lib/assetBridger/assetBridger.ts
+++ b/src/lib/assetBridger/assetBridger.ts
@@ -20,7 +20,11 @@ import { ArbSdkError } from '../dataEntities/errors'
 import { L1ContractTransaction } from '../message/L1Transaction'
 import { L2ContractTransaction } from '../message/L2Transaction'
 
-import { l1Networks, L1Network, L2Network } from '../dataEntities/networks'
+import {
+  parentChains as l1Networks,
+  ParentChain as L1Network,
+  ChildChain as L2Network,
+} from '../dataEntities/networks'
 import {
   SignerOrProvider,
   SignerProviderUtils,
@@ -33,10 +37,10 @@ export abstract class AssetBridger<DepositParams, WithdrawParams> {
   public readonly l1Network: L1Network
 
   public constructor(public readonly l2Network: L2Network) {
-    this.l1Network = l1Networks[l2Network.partnerChainID]
+    this.l1Network = l1Networks[l2Network.parentChainId]
     if (!this.l1Network) {
       throw new ArbSdkError(
-        `Unknown l1 network chain id: ${l2Network.partnerChainID}`
+        `Unknown l1 network chain id: ${l2Network.parentChainId}`
       )
     }
   }
diff --git a/src/lib/assetBridger/erc20Bridger.ts b/src/lib/assetBridger/erc20Bridger.ts
index d4883ac22f..1504a03420 100644
--- a/src/lib/assetBridger/erc20Bridger.ts
+++ b/src/lib/assetBridger/erc20Bridger.ts
@@ -45,7 +45,10 @@ import {
   L1ToL2MessageGasEstimator,
 } from '../message/L1ToL2MessageGasEstimator'
 import { SignerProviderUtils } from '../dataEntities/signerOrProvider'
-import { L2Network, getL2Network } from '../dataEntities/networks'
+import {
+  ChildChain as L2Network,
+  getChildChain as getL2Network,
+} from '../dataEntities/networks'
 import { ArbSdkError, MissingProviderArbSdkError } from '../dataEntities/errors'
 import { DISABLED_GATEWAY } from '../dataEntities/constants'
 import { EventFetcher } from '../utils/eventFetcher'
diff --git a/src/lib/assetBridger/ethBridger.ts b/src/lib/assetBridger/ethBridger.ts
index 4441f3d7f6..204b22fee4 100644
--- a/src/lib/assetBridger/ethBridger.ts
+++ b/src/lib/assetBridger/ethBridger.ts
@@ -45,7 +45,7 @@ import {
 import { OmitTyped } from '../utils/types'
 import { SignerProviderUtils } from '../dataEntities/signerOrProvider'
 import { MissingProviderArbSdkError } from '../dataEntities/errors'
-import { getL2Network } from '../dataEntities/networks'
+import { getChildChain as getL2Network } from '../dataEntities/networks'
 
 export interface EthWithdrawParams {
   /**
diff --git a/src/lib/dataEntities/networks.ts b/src/lib/dataEntities/networks.ts
index 8199dae1b8..ce0bb72f41 100644
--- a/src/lib/dataEntities/networks.ts
+++ b/src/lib/dataEntities/networks.ts
@@ -21,16 +21,16 @@ import { ArbSdkError } from '../dataEntities/errors'
 import { SEVEN_DAYS_IN_SECONDS } from './constants'
 import { RollupAdminLogic__factory } from '../abi/factories/RollupAdminLogic__factory'
 
-export interface L1Network extends Network {
-  partnerChainIDs: number[]
+export interface ParentChain extends Network {
+  childChainIds: number[]
   blockTime: number //seconds
   isArbitrum: false
 }
 
-export interface L2Network extends Network {
+export interface ChildChain extends Network {
   tokenBridge: TokenBridge
   ethBridge: EthBridge
-  partnerChainID: number
+  parentChainId: number
   isArbitrum: true
   confirmPeriodBlocks: number
   retryableLifetimeSeconds: number
@@ -77,12 +77,12 @@ export interface EthBridge {
   }
 }
 
-export interface L1Networks {
-  [id: string]: L1Network
+export interface ParentChains {
+  [id: string]: ParentChain
 }
 
-export interface L2Networks {
-  [id: string]: L2Network
+export interface ChildChains {
+  [id: string]: ChildChain
 }
 
 const mainnetTokenBridge: TokenBridge = {
@@ -114,12 +114,12 @@ const mainnetETHBridge: EthBridge = {
   },
 }
 
-export const l1Networks: L1Networks = {
+export const parentChains: ParentChains = {
   1: {
     chainID: 1,
     name: 'Mainnet',
     explorerUrl: 'https://etherscan.io',
-    partnerChainIDs: [42161, 42170],
+    childChainIds: [42161, 42170],
     blockTime: 14,
     isCustom: false,
     isArbitrum: false,
@@ -128,7 +128,7 @@ export const l1Networks: L1Networks = {
     chainID: 1338,
     name: 'Hardhat_Mainnet_Fork',
     explorerUrl: 'https://etherscan.io',
-    partnerChainIDs: [42161],
+    childChainIds: [42161],
     blockTime: 1,
     isCustom: false,
     isArbitrum: false,
@@ -139,26 +139,26 @@ export const l1Networks: L1Networks = {
     explorerUrl: 'https://goerli.etherscan.io',
     isCustom: false,
     name: 'Goerli',
-    partnerChainIDs: [421613],
+    childChainIds: [421613],
     isArbitrum: false,
   },
   11155111: {
     chainID: 11155111,
     name: 'Sepolia',
     explorerUrl: 'https://sepolia.etherscan.io',
-    partnerChainIDs: [421614],
+    childChainIds: [421614],
     blockTime: 12,
     isCustom: false,
     isArbitrum: false,
   },
 }
 
-export const l2Networks: L2Networks = {
+export const childChains: ChildChains = {
   42161: {
     chainID: 42161,
     name: 'Arbitrum One',
     explorerUrl: 'https://arbiscan.io',
-    partnerChainID: 1,
+    parentChainId: 1,
     isArbitrum: true,
     tokenBridge: mainnetTokenBridge,
     ethBridge: mainnetETHBridge,
@@ -189,7 +189,7 @@ export const l2Networks: L2Networks = {
     isArbitrum: true,
     isCustom: false,
     name: 'Arbitrum Rollup Goerli Testnet',
-    partnerChainID: 5,
+    parentChainId: 5,
     tokenBridge: {
       l1CustomGateway: '0x9fDD1C4E4AA24EEc1d913FABea925594a20d43C7',
       l1ERC20Gateway: '0x715D99480b77A8d9D603638e593a539E21345FdF',
@@ -228,7 +228,7 @@ export const l2Networks: L2Networks = {
     isArbitrum: true,
     isCustom: false,
     name: 'Arbitrum Nova',
-    partnerChainID: 1,
+    parentChainId: 1,
     retryableLifetimeSeconds: SEVEN_DAYS_IN_SECONDS,
     tokenBridge: {
       l1CustomGateway: '0x23122da8C581AA7E0d07A36Ff1f16F799650232f',
@@ -269,7 +269,7 @@ export const l2Networks: L2Networks = {
     isArbitrum: true,
     isCustom: false,
     name: 'Arbitrum Rollup Sepolia Testnet',
-    partnerChainID: 11155111,
+    parentChainId: 11155111,
     retryableLifetimeSeconds: SEVEN_DAYS_IN_SECONDS,
     tokenBridge: {
       l1CustomGateway: '0xba2F7B6eAe1F9d174199C5E4867b563E0eaC40F3',
@@ -305,7 +305,7 @@ export const l2Networks: L2Networks = {
     isArbitrum: true,
     isCustom: false,
     name: 'Stylus Testnet',
-    partnerChainID: 421614,
+    parentChainId: 421614,
     retryableLifetimeSeconds: SEVEN_DAYS_IN_SECONDS,
     tokenBridge: {
       l1CustomGateway: '0xd624D491A5Bc32de52a2e1481846752213bF7415',
@@ -345,7 +345,7 @@ const getNetwork = async (
     return chainId
   })()
 
-  const networks = layer === 1 ? l1Networks : l2Networks
+  const networks = layer === 1 ? parentChains : childChains
   if (networks[chainID]) {
     return networks[chainID]
   } else {
@@ -353,15 +353,15 @@ const getNetwork = async (
   }
 }
 
-export const getL1Network = (
+export const getParentChain = (
   signerOrProviderOrChainID: SignerOrProvider | number
-): Promise<L1Network> => {
-  return getNetwork(signerOrProviderOrChainID, 1) as Promise<L1Network>
+): Promise<ParentChain> => {
+  return getNetwork(signerOrProviderOrChainID, 1) as Promise<ParentChain>
 }
-export const getL2Network = (
+export const getChildChain = (
   signerOrProviderOrChainID: SignerOrProvider | number
-): Promise<L2Network> => {
-  return getNetwork(signerOrProviderOrChainID, 2) as Promise<L2Network>
+): Promise<ChildChain> => {
+  return getNetwork(signerOrProviderOrChainID, 2) as Promise<ChildChain>
 }
 
 /**
@@ -396,44 +396,47 @@ export const getEthBridgeInformation = async (
 }
 
 export const addCustomNetwork = ({
-  customL1Network,
-  customL2Network,
+  customParentChain,
+  customChildChain,
 }: {
-  customL1Network?: L1Network
-  customL2Network: L2Network
+  customParentChain?: ParentChain
+  customChildChain: ChildChain
 }): void => {
-  if (customL1Network) {
-    if (l1Networks[customL1Network.chainID]) {
+  console.log({ customChildChain })
+  if (customParentChain) {
+    if (parentChains[customParentChain.chainID]) {
       throw new ArbSdkError(
-        `Network ${customL1Network.chainID} already included`
+        `Network ${customParentChain.chainID} already included`
       )
-    } else if (!customL1Network.isCustom) {
+    } else if (!customParentChain.isCustom) {
       throw new ArbSdkError(
-        `Custom network ${customL1Network.chainID} must have isCustom flag set to true`
+        `Custom network ${customParentChain.chainID} must have isCustom flag set to true`
       )
     } else {
-      l1Networks[customL1Network.chainID] = customL1Network
+      parentChains[customParentChain.chainID] = customParentChain
     }
   }
 
-  if (l2Networks[customL2Network.chainID])
-    throw new ArbSdkError(`Network ${customL2Network.chainID} already included`)
-  else if (!customL2Network.isCustom) {
+  if (childChains[customChildChain.chainID])
     throw new ArbSdkError(
-      `Custom network ${customL2Network.chainID} must have isCustom flag set to true`
+      `Network ${customChildChain.chainID} already included`
+    )
+  else if (!customChildChain.isCustom) {
+    throw new ArbSdkError(
+      `Custom network ${customChildChain.chainID} must have isCustom flag set to true`
     )
   }
 
-  l2Networks[customL2Network.chainID] = customL2Network
+  childChains[customChildChain.chainID] = customChildChain
 
-  const l1PartnerChain = l1Networks[customL2Network.partnerChainID]
-  if (!l1PartnerChain)
+  const parentChainChildChain = parentChains[customChildChain.parentChainId]
+  if (!parentChainChildChain)
     throw new ArbSdkError(
-      `Network ${customL2Network.chainID}'s partner network, ${customL2Network.partnerChainID}, not recognized`
+      `Network ${customChildChain.chainID}'s parent chain, ${customChildChain.parentChainId}, not recognized`
     )
 
-  if (!l1PartnerChain.partnerChainIDs.includes(customL2Network.chainID)) {
-    l1PartnerChain.partnerChainIDs.push(customL2Network.chainID)
+  if (!parentChainChildChain.childChainIds.includes(customChildChain.chainID)) {
+    parentChainChildChain.childChainIds.push(customChildChain.chainID)
   }
 }
 
@@ -443,20 +446,20 @@ export const addCustomNetwork = ({
  * @see {@link https://github.com/OffchainLabs/nitro}
  */
 export const addDefaultLocalNetwork = (): {
-  l1Network: L1Network
-  l2Network: L2Network
+  parentChain: ParentChain
+  chain: ChildChain
 } => {
-  const defaultLocalL1Network: L1Network = {
+  const defaultLocalParentChain: ParentChain = {
     blockTime: 10,
     chainID: 1337,
     explorerUrl: '',
     isCustom: true,
     name: 'EthLocal',
-    partnerChainIDs: [412346],
+    childChainIds: [412346],
     isArbitrum: false,
   }
 
-  const defaultLocalL2Network: L2Network = {
+  const defaultLocalChain: ChildChain = {
     chainID: 412346,
     confirmPeriodBlocks: 20,
     ethBridge: {
@@ -470,7 +473,7 @@ export const addDefaultLocalNetwork = (): {
     isArbitrum: true,
     isCustom: true,
     name: 'ArbLocal',
-    partnerChainID: 1337,
+    parentChainId: 1337,
     retryableLifetimeSeconds: 604800,
     nitroGenesisBlock: 0,
     nitroGenesisL1Block: 0,
@@ -494,19 +497,19 @@ export const addDefaultLocalNetwork = (): {
   }
 
   addCustomNetwork({
-    customL1Network: defaultLocalL1Network,
-    customL2Network: defaultLocalL2Network,
+    customParentChain: defaultLocalParentChain,
+    customChildChain: defaultLocalChain,
   })
 
   return {
-    l1Network: defaultLocalL1Network,
-    l2Network: defaultLocalL2Network,
+    parentChain: defaultLocalParentChain,
+    chain: defaultLocalChain,
   }
 }
 
-export const isL1Network = (
-  network: L1Network | L2Network
-): network is L1Network => {
-  if ((network as L1Network).partnerChainIDs) return true
+export const isParentChain = (
+  network: ParentChain | ChildChain
+): network is ParentChain => {
+  if ((network as ParentChain).childChainIds) return true
   else return false
 }
diff --git a/src/lib/inbox/inbox.ts b/src/lib/inbox/inbox.ts
index 5f2759164c..3e629b2c21 100644
--- a/src/lib/inbox/inbox.ts
+++ b/src/lib/inbox/inbox.ts
@@ -28,10 +28,7 @@ import { SequencerInbox__factory } from '../abi/factories/SequencerInbox__factor
 import { IInbox__factory } from '../abi/factories/IInbox__factory'
 import { RequiredPick } from '../utils/types'
 import { MessageDeliveredEvent } from '../abi/Bridge'
-import {
-  l1Networks as parentChains,
-  L2Network as ChildChain,
-} from '../dataEntities/networks'
+import { parentChains, ChildChain } from '../dataEntities/networks'
 import { SignerProviderUtils } from '../dataEntities/signerOrProvider'
 import { FetchedEvent, EventFetcher } from '../utils/eventFetcher'
 import { MultiCaller, CallInput } from '../utils/multicall'
@@ -70,10 +67,10 @@ export class InboxTools {
     this.parentChainProvider = SignerProviderUtils.getProviderOrThrow(
       this.parentChainSigner
     )
-    this.parentChain = parentChains[childChain.partnerChainID]
+    this.parentChain = parentChains[childChain.parentChainId]
     if (!this.parentChain)
       throw new ArbSdkError(
-        `ParentChainNetwork not found for chain id: ${childChain.partnerChainID}.`
+        `ParentChain not found for chain id: ${childChain.parentChainId}.`
       )
   }
 
diff --git a/src/lib/message/L1ToL2Message.ts b/src/lib/message/L1ToL2Message.ts
index 2339c77576..7fcc3adabb 100644
--- a/src/lib/message/L1ToL2Message.ts
+++ b/src/lib/message/L1ToL2Message.ts
@@ -34,7 +34,7 @@ import {
 import { ArbSdkError } from '../dataEntities/errors'
 import { ethers, Overrides } from 'ethers'
 import { L2TransactionReceipt, RedeemTransaction } from './L2Transaction'
-import { getL2Network } from '../../lib/dataEntities/networks'
+import { getChildChain as getL2Network } from '../../lib/dataEntities/networks'
 import { RetryableMessageParams } from '../dataEntities/message'
 import { getTransactionReceipt, isDefined } from '../utils/lib'
 import { EventFetcher } from '../utils/eventFetcher'
diff --git a/src/lib/message/L1ToL2MessageCreator.ts b/src/lib/message/L1ToL2MessageCreator.ts
index d930e2b22f..7823cc9aae 100644
--- a/src/lib/message/L1ToL2MessageCreator.ts
+++ b/src/lib/message/L1ToL2MessageCreator.ts
@@ -7,7 +7,7 @@ import {
 } from './L1ToL2MessageGasEstimator'
 import { L1ContractTransaction, L1TransactionReceipt } from './L1Transaction'
 import { Inbox__factory } from '../abi/factories/Inbox__factory'
-import { getL2Network } from '../dataEntities/networks'
+import { getChildChain as getL2Network } from '../dataEntities/networks'
 import { PayableOverrides } from '@ethersproject/contracts'
 import { SignerProviderUtils } from '../dataEntities/signerOrProvider'
 import { MissingProviderArbSdkError } from '../dataEntities/errors'
diff --git a/src/lib/message/L1ToL2MessageGasEstimator.ts b/src/lib/message/L1ToL2MessageGasEstimator.ts
index 99c7686fc1..128ecb9e59 100644
--- a/src/lib/message/L1ToL2MessageGasEstimator.ts
+++ b/src/lib/message/L1ToL2MessageGasEstimator.ts
@@ -5,7 +5,7 @@ import { Inbox__factory } from '../abi/factories/Inbox__factory'
 import { NodeInterface__factory } from '../abi/factories/NodeInterface__factory'
 import { NODE_INTERFACE_ADDRESS } from '../dataEntities/constants'
 import { ArbSdkError } from '../dataEntities/errors'
-import { getL2Network } from '../dataEntities/networks'
+import { getChildChain as getL2Network } from '../dataEntities/networks'
 import {
   RetryableData,
   RetryableDataTools,
diff --git a/src/lib/message/L1Transaction.ts b/src/lib/message/L1Transaction.ts
index d2b79b3e4b..d2ab95eb0f 100644
--- a/src/lib/message/L1Transaction.ts
+++ b/src/lib/message/L1Transaction.ts
@@ -46,7 +46,7 @@ import { MessageDeliveredEvent } from '../abi/Bridge'
 import { EventArgs, parseTypedLogs } from '../dataEntities/event'
 import { isDefined } from '../utils/lib'
 import { SubmitRetryableMessageDataParser } from './messageDataParser'
-import { getL2Network } from '../dataEntities/networks'
+import { getChildChain as getL2Network } from '../dataEntities/networks'
 
 export interface L1ContractTransaction<
   TReceipt extends L1TransactionReceipt = L1TransactionReceipt
diff --git a/src/lib/message/L2ToL1Message.ts b/src/lib/message/L2ToL1Message.ts
index 1b3d1a4bce..fcde6086c6 100644
--- a/src/lib/message/L2ToL1Message.ts
+++ b/src/lib/message/L2ToL1Message.ts
@@ -35,7 +35,7 @@ import {
 import { isDefined } from '../utils/lib'
 import { EventArgs } from '../dataEntities/event'
 import { L2ToL1MessageStatus } from '../dataEntities/message'
-import { getL2Network } from '../dataEntities/networks'
+import { getChildChain as getL2Network } from '../dataEntities/networks'
 import { ArbSdkError } from '../dataEntities/errors'
 
 export type L2ToL1TransactionEvent =
diff --git a/src/lib/message/L2ToL1MessageClassic.ts b/src/lib/message/L2ToL1MessageClassic.ts
index 1edba7fc1d..e04c050a27 100644
--- a/src/lib/message/L2ToL1MessageClassic.ts
+++ b/src/lib/message/L2ToL1MessageClassic.ts
@@ -40,7 +40,7 @@ import { isDefined, wait } from '../utils/lib'
 import { ArbSdkError } from '../dataEntities/errors'
 import { EventArgs } from '../dataEntities/event'
 import { L2ToL1MessageStatus } from '../dataEntities/message'
-import { getL2Network } from '../dataEntities/networks'
+import { getChildChain as getL2Network } from '../dataEntities/networks'
 
 export interface MessageBatchProofInfo {
   /**
diff --git a/src/lib/message/L2ToL1MessageNitro.ts b/src/lib/message/L2ToL1MessageNitro.ts
index ac8dbd0af5..3fb6a1c92c 100644
--- a/src/lib/message/L2ToL1MessageNitro.ts
+++ b/src/lib/message/L2ToL1MessageNitro.ts
@@ -40,7 +40,7 @@ import {
   SignerOrProvider,
 } from '../dataEntities/signerOrProvider'
 import { getBlockRangesForL1Block, isArbitrumChain, wait } from '../utils/lib'
-import { getL2Network } from '../dataEntities/networks'
+import { getChildChain as getL2Network } from '../dataEntities/networks'
 import { NodeCreatedEvent, RollupUserLogic } from '../abi/RollupUserLogic'
 import { ArbitrumProvider } from '../utils/arbProvider'
 import { ArbBlock } from '../dataEntities/rpc'
diff --git a/src/lib/utils/lib.ts b/src/lib/utils/lib.ts
index c40341e1e6..40bf2b26cc 100644
--- a/src/lib/utils/lib.ts
+++ b/src/lib/utils/lib.ts
@@ -2,7 +2,7 @@ import { Provider } from '@ethersproject/abstract-provider'
 import { TransactionReceipt, JsonRpcProvider } from '@ethersproject/providers'
 import { ArbSdkError } from '../dataEntities/errors'
 import { ArbitrumProvider } from './arbProvider'
-import { l2Networks } from '../dataEntities/networks'
+import { childChains } from '../dataEntities/networks'
 import { ArbSys__factory } from '../abi/factories/ArbSys__factory'
 import { ARB_SYS_ADDRESS } from '../dataEntities/constants'
 
@@ -100,7 +100,7 @@ export async function getFirstBlockForL1Block({
   const arbProvider = new ArbitrumProvider(provider)
   const currentArbBlock = await arbProvider.getBlockNumber()
   const arbitrumChainId = (await arbProvider.getNetwork()).chainId
-  const { nitroGenesisBlock } = l2Networks[arbitrumChainId]
+  const { nitroGenesisBlock } = childChains[arbitrumChainId]
 
   async function getL1Block(forL2Block: number) {
     const { l1BlockNumber } = await arbProvider.getBlock(forL2Block)
diff --git a/src/lib/utils/multicall.ts b/src/lib/utils/multicall.ts
index 187b170c1f..b100b74b85 100644
--- a/src/lib/utils/multicall.ts
+++ b/src/lib/utils/multicall.ts
@@ -24,11 +24,11 @@ import { Multicall2 } from '../abi/Multicall2'
 import { Multicall2__factory } from '../abi/factories/Multicall2__factory'
 import { ArbSdkError } from '../dataEntities/errors'
 import {
-  isL1Network,
-  L1Network,
-  l1Networks,
-  L2Network,
-  l2Networks,
+  isParentChain as isL1Network,
+  ParentChain as L1Network,
+  parentChains as l1Networks,
+  ChildChain as L2Network,
+  childChains as l2Networks,
 } from '../dataEntities/networks'
 
 /**
@@ -143,10 +143,10 @@ export class MultiCaller {
 
     let multiCallAddr: string
     if (isL1Network(network)) {
-      const firstL2 = l2Networks[network.partnerChainIDs[0]]
+      const firstL2 = l2Networks[network.childChainIds[0]]
       if (!firstL2)
         throw new ArbSdkError(
-          `No partner chain found l1 network: ${network.chainID} : partner chain ids ${network.partnerChainIDs}`
+          `No child chain found l1 network: ${network.chainID} : child chain ids ${network.childChainIds}`
         )
       multiCallAddr = firstL2.tokenBridge.l1MultiCall
     } else {
diff --git a/tests/fork/inbox.test.ts b/tests/fork/inbox.test.ts
index d91c238ee2..7ed76a4790 100644
--- a/tests/fork/inbox.test.ts
+++ b/tests/fork/inbox.test.ts
@@ -30,7 +30,10 @@ import { InboxTools } from '../../src'
 
 import { ethers, network } from 'hardhat'
 import { hexZeroPad } from '@ethersproject/bytes'
-import { L2Network, getL2Network } from '../../src/lib/dataEntities/networks'
+import {
+  ChildChain as L2Network,
+  getChildChain as getL2Network,
+} from '../../src/lib/dataEntities/networks'
 import { solidityKeccak256 } from 'ethers/lib/utils'
 import { ContractTransaction, Signer } from 'ethers'
 
diff --git a/tests/integration/ethBridgeAddresses.test.ts b/tests/integration/ethBridgeAddresses.test.ts
index 5d9db19974..57c9eb8b62 100644
--- a/tests/integration/ethBridgeAddresses.test.ts
+++ b/tests/integration/ethBridgeAddresses.test.ts
@@ -3,7 +3,7 @@ import { expect } from 'chai'
 import {
   EthBridge,
   getEthBridgeInformation,
-  getL2Network,
+  getChildChain as getL2Network,
 } from '../../src/lib/dataEntities/networks'
 import dotenv from 'dotenv'
 dotenv.config()
diff --git a/tests/integration/sendL2msg.test.ts b/tests/integration/sendL2msg.test.ts
index e9bcdd97ae..591d4f994c 100644
--- a/tests/integration/sendL2msg.test.ts
+++ b/tests/integration/sendL2msg.test.ts
@@ -19,7 +19,10 @@
 
 import { BigNumber, ethers, Signer } from 'ethers'
 import { InboxTools } from '../../src/lib/inbox/inbox'
-import { getL2Network, L2Network } from '../../src/lib/dataEntities/networks'
+import {
+  getChildChain as getL2Network,
+  ChildChain as L2Network,
+} from '../../src/lib/dataEntities/networks'
 import { testSetup } from '../../scripts/testSetup'
 import { greeter } from './helper/greeter'
 import { expect } from 'chai'
diff --git a/tests/integration/testHelpers.ts b/tests/integration/testHelpers.ts
index a258c96daf..dea1b93d19 100644
--- a/tests/integration/testHelpers.ts
+++ b/tests/integration/testHelpers.ts
@@ -31,7 +31,7 @@ import {
   L1ToL2MessageStatus,
   L2ToL1MessageStatus,
 } from '../../src'
-import { L2Network } from '../../src/lib/dataEntities/networks'
+import { ChildChain as L2Network } from '../../src/lib/dataEntities/networks'
 import { GasOverrides } from '../../src/lib/message/L1ToL2MessageGasEstimator'
 import { ArbSdkError } from '../../src/lib/dataEntities/errors'
 import { ERC20 } from '../../src/lib/abi/ERC20'
diff --git a/tests/unit/l2toL1MessageEvents.test.ts b/tests/unit/l2toL1MessageEvents.test.ts
index 8fff9e597b..d17bc71018 100644
--- a/tests/unit/l2toL1MessageEvents.test.ts
+++ b/tests/unit/l2toL1MessageEvents.test.ts
@@ -19,7 +19,7 @@
 import { Logger, LogLevel } from '@ethersproject/logger'
 Logger.setLogLevel(LogLevel.ERROR)
 import { L2ToL1Message } from '../../src'
-import { getL2Network } from '../../src/lib/dataEntities/networks'
+import { getChildChain as getL2Network } from '../../src/lib/dataEntities/networks'
 import { providers } from 'ethers'
 import { anything, deepEqual, instance, mock, verify, when } from 'ts-mockito'
 
diff --git a/tests/unit/multicall.test.ts b/tests/unit/multicall.test.ts
index 8db7e1dd6a..94b8cdf22d 100644
--- a/tests/unit/multicall.test.ts
+++ b/tests/unit/multicall.test.ts
@@ -1,6 +1,6 @@
 'use strict'
 
-import { getL2Network } from '../../src/lib/dataEntities/networks'
+import { getChildChain as getL2Network } from '../../src/lib/dataEntities/networks'
 import { providers } from 'ethers'
 import { mock, when, anything, instance, deepEqual } from 'ts-mockito'
 import { expect } from 'chai'