diff --git a/tabularray/tabularray.sty b/tabularray/tabularray.sty
index 79c5443..10e632f 100644
--- a/tabularray/tabularray.sty
+++ b/tabularray/tabularray.sty
@@ -906,7 +906,7 @@
         \exp_args:NcV \NewDocumentCommand
           { __tblr_table_cmd_ \l__tblr_tmpa_tl :w } \l__tblr_tmpb_tl { #4 }
         %% we can not use \cs_if_exist:NTF here (see issue #328)
-        \__zutil_cs_if_defined:NTF #1
+        \zutil_cs_if_defined:NTF #1
           {
             \cs_set_eq:cN { __tblr_table_cmd_ \l__tblr_tmpa_tl _saved:w } #1
           }
@@ -927,7 +927,7 @@
   }
 
 \cs_new:Npn \__tblr_if_table_command:NTF #1
-  { \__zutil_cs_if_defined:cTF { __tblr_table_cmd_ \cs_to_str:N #1 :w } }
+  { \zutil_cs_if_defined:cTF { __tblr_table_cmd_ \cs_to_str:N #1 :w } }
 
 \cs_new_protected:Npn \__tblr_enable_table_commands:
   {
diff --git a/zutil/testfiles/zutil-l3extras.lvt b/zutil/testfiles/zutil-l3extras.lvt
index 3ba7d5e..5043835 100644
--- a/zutil/testfiles/zutil-l3extras.lvt
+++ b/zutil/testfiles/zutil-l3extras.lvt
@@ -9,16 +9,16 @@
 
 \START
 
-\TEST{\__zutil_cs_if_defined:NTF}{
-  \__zutil_cs_if_defined:NTF \zutil_set:n     \TRUE \ERROR
-  \__zutil_cs_if_defined:NTF \scan_stop:      \TRUE \ERROR
-  \__zutil_cs_if_defined:NTF \tex_undefined:D \ERROR \TRUE
+\TEST{\zutil_cs_if_defined:NTF}{
+  \zutil_cs_if_defined:NTF \zutil_set:n     \TRUE \ERROR
+  \zutil_cs_if_defined:NTF \scan_stop:      \TRUE \ERROR
+  \zutil_cs_if_defined:NTF \tex_undefined:D \ERROR \TRUE
 }
 
-\TEST{\__zutil_cs_if_defined:cTF}{
-  \__zutil_cs_if_defined:cTF { zutil_set:n }      \TRUE \ERROR
-  \__zutil_cs_if_defined:cTF { scan_stop: }       \TRUE \ERROR
-  \__zutil_cs_if_defined:cTF { tex_undefined:D }  \ERROR \TRUE
+\TEST{\zutil_cs_if_defined:cTF}{
+  \zutil_cs_if_defined:cTF { zutil_set:n }      \TRUE \ERROR
+  \zutil_cs_if_defined:cTF { scan_stop: }       \TRUE \ERROR
+  \zutil_cs_if_defined:cTF { tex_undefined:D }  \ERROR \TRUE
 }
 
 \OMIT
diff --git a/zutil/testfiles/zutil-l3extras.tlg b/zutil/testfiles/zutil-l3extras.tlg
index 30bc59f..b755a76 100644
--- a/zutil/testfiles/zutil-l3extras.tlg
+++ b/zutil/testfiles/zutil-l3extras.tlg
@@ -1,14 +1,14 @@
 This is a generated file for the l3build validation system.
 Don't change this file in any respect.
 ============================================================
-TEST: \__zutil_cs_if_defined:NTF 
+TEST: \zutil_cs_if_defined:NTF 
 ============================================================
 TRUE
 TRUE
 TRUE
 ============================================================
 ============================================================
-TEST: \__zutil_cs_if_defined:cTF 
+TEST: \zutil_cs_if_defined:cTF 
 ============================================================
 TRUE
 TRUE
diff --git a/zutil/zutil-debug.code.tex b/zutil/zutil-debug.code.tex
index 28c99b5..9467e1d 100644
--- a/zutil/zutil-debug.code.tex
+++ b/zutil/zutil-debug.code.tex
@@ -308,12 +308,12 @@
 
 \cs_new:Npn \__zutil_debug_use:N #1
   {
-    \__zutil_cs_if_defined:NTF #1
+    \zutil_cs_if_defined:NTF #1
       { \cs_replacement_spec:N #1 } { \tl_to_str:n { undefined } }
   }
 \cs_new:Npn \__zutil_debug_use:c #1
   {
-    \__zutil_cs_if_defined:cTF {#1}
+    \zutil_cs_if_defined:cTF {#1}
       { \cs_replacement_spec:c {#1} } { \tl_to_str:n { undefined } }
   }
 
diff --git a/zutil/zutil-l3extras.code.tex b/zutil/zutil-l3extras.code.tex
index 9dcfebd..7d865b5 100644
--- a/zutil/zutil-l3extras.code.tex
+++ b/zutil/zutil-l3extras.code.tex
@@ -6,7 +6,7 @@
 %%
 
 % Treat \relax as defined, thus different from \cs_if_exist:NTF.
-\prg_set_conditional:Npnn \__zutil_cs_if_defined:N #1 { p, T, F, TF }
+\prg_set_conditional:Npnn \zutil_cs_if_defined:N #1 { p, T, F, TF }
   {
     \if_cs_exist:N #1
       \prg_return_true:
@@ -14,7 +14,7 @@
       \prg_return_false:
     \fi:
   }
-\prg_set_conditional:Npnn \__zutil_cs_if_defined:c #1 { p, T, F, TF }
+\prg_set_conditional:Npnn \zutil_cs_if_defined:c #1 { p, T, F, TF }
   {
     \if_cs_exist:w #1 \cs_end:
       \prg_return_true: