diff --git a/R/group_tabularray.R b/R/group_tabularray.R
index 188ad571..a2a971de 100644
--- a/R/group_tabularray.R
+++ b/R/group_tabularray.R
@@ -20,8 +20,8 @@ group_tabularray_col <- function(x, j, ihead, ...) {
   out <- strsplit(x@table_string, split = "\\n")[[1]]
 
   header <- rep("", ncol(x))
-  for (n in names(j)) {
-    header[min(j[[n]])] <- n
+  for (idx in seq_along(j)) {
+    header[min(j[[idx]])] <- names(j)[idx]
   }
   header <- paste(header, collapse = " & ")
 
diff --git a/inst/tinytest/_tinysnapshot/group_tt-issue362_duplicate_colum_labels.tex b/inst/tinytest/_tinysnapshot/group_tt-issue362_duplicate_colum_labels.tex
new file mode 100644
index 00000000..adc3b0fe
--- /dev/null
+++ b/inst/tinytest/_tinysnapshot/group_tt-issue362_duplicate_colum_labels.tex
@@ -0,0 +1,16 @@
+\begin{table}
+\centering
+\begin{tblr}[         %% tabularray outer open
+]                     %% tabularray outer close
+{                     %% tabularray inner open
+colspec={Q[]Q[]Q[]Q[]},
+cell{1}{1}={c=2,}{halign=c,},
+cell{1}{3}={c=2,}{halign=c,},
+}                     %% tabularray inner close
+\toprule
+a &  & a &  \\ \cmidrule[lr]{1-2}\cmidrule[lr]{3-4}
+sub1 & sub2 & sub1 & sub2 \\ \midrule %% TinyTableHeader
+1 & 2 & 3 & 4 \\
+\bottomrule
+\end{tblr}
+\end{table} 
diff --git a/inst/tinytest/test-group_tt.R b/inst/tinytest/test-group_tt.R
index a05dcbdc..626019d6 100644
--- a/inst/tinytest/test-group_tt.R
+++ b/inst/tinytest/test-group_tt.R
@@ -29,6 +29,7 @@ tab <- tt(x) |>
     group_tt(j = list("a" = 2:3, "b" = 4:5)) |>
     group_tt(j = list("c" = 1:2, "d" = 3:5)) |>
     group_tt(j = list("e" = 1:3, "f" = 4))
+tab@output <- "latex"
 expect_snapshot_print(tab, label = "group_tt-3level.tex")
 options(tinytable_print_output = NULL)
 
@@ -103,3 +104,12 @@ for (o in c("latex", "typst", "markdown", "html")) {
 
     options(tinytable_print_output = NULL)
 }
+
+
+# Issue #362: group_tt with duplicate column group labels in latex
+tab <- data.frame(sub1 = 1, sub2 = 2, sub1 = 3, sub2 = 4, check.names = FALSE) |>
+    tt() |>
+    group_tt(j = list(a = 1:2, a = 3:4))
+tab@output <- "latex"
+expect_snapshot_print(tab, "group_tt-issue362_duplicate_colum_labels.tex")
+