diff --git a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/isos.kt b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/isos.kt
index 89c730ac6af..8d03c00fd4a 100644
--- a/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/isos.kt
+++ b/arrow-libs/optics/arrow-optics-ksp-plugin/src/main/kotlin/arrow/optics/plugin/internals/isos.kt
@@ -8,7 +8,30 @@ inline val Target.targetNames
 
 private fun processElement(iso: ADT, target: Target): String {
   val foci = target.foci
-  val letters = ('a'..'v').toList()
+  val letters = listOf(
+    "first",
+    "second",
+    "third",
+    "fourth",
+    "fifth",
+    "sixth",
+    "seventh",
+    "eighth",
+    "ninth",
+    "tenth",
+    "eleventh",
+    "twelfth",
+    "thirteenth",
+    "fourteenth",
+    "fifteenth",
+    "sixteenth",
+    "seventeenth",
+    "eighteenth",
+    "nineteenth",
+    "twentieth",
+    "twentyFirst",
+    "twentySecond"
+  )
 
   fun Focus.format(): String =
     "${iso.sourceName}.${paramName.plusIfNotBlank(prefix = "`", postfix = "`")}"