diff --git a/lib/hcl-prv.h b/lib/hcl-prv.h
index 3cabab2..91021c5 100644
--- a/lib/hcl-prv.h
+++ b/lib/hcl-prv.h
@@ -777,13 +777,13 @@ hcl_oop_process_t hcl_makeproc (
 /* ========================================================================= */
 /* utf8.c                                                                    */
 /* ========================================================================= */
-hcl_oow_t hcl_uctoutf8 (
+hcl_oow_t hcl_uc_to_utf8 (
 	hcl_uch_t    uc,
 	hcl_bch_t*   utf8,
 	hcl_oow_t    size
 );
 
-hcl_oow_t hcl_utf8touc (
+hcl_oow_t hcl_utf8_to_uc (
 	const hcl_bch_t* utf8,
 	hcl_oow_t        size,
 	hcl_uch_t*       uc
@@ -797,7 +797,7 @@ int hcl_ucstoutf8 (
 );
 
 /**
- * The hcl_utf8toucs() function converts a UTF8 string to a uncide string.
+ * The hcl_utf8_to_ucs() function converts a UTF8 string to a uncide string.
  *
  * It never returns -2 if \a ucs is #HCL_NULL.
  *
@@ -807,7 +807,7 @@ int hcl_ucstoutf8 (
  *  hcl_oow_t ucslen = HCL_COUNTOF(buf), n;
  *  hcl_oow_t bcslen = 11;
  *  int n;
- *  n = hcl_utf8toucs (bcs, &bcslen, ucs, &ucslen);
+ *  n = hcl_utf8_to_ucs (bcs, &bcslen, ucs, &ucslen);
  *  if (n <= -1) { invalid/incomplenete sequence or buffer to small }
  * \endcode
  *
@@ -824,7 +824,7 @@ int hcl_ucstoutf8 (
  *         -2 if the wide-character string buffer is too small.
  *         -3 if \a bcs is not a complete sequence.
  */
-int hcl_utf8toucs (
+int hcl_utf8_to_ucs (
 	const hcl_bch_t*   bcs,
 	hcl_oow_t*         bcslen,
 	hcl_uch_t*         ucs,
diff --git a/lib/hcl-utl.h b/lib/hcl-utl.h
index 85eec67..4edf74d 100644
--- a/lib/hcl-utl.h
+++ b/lib/hcl-utl.h
@@ -538,13 +538,13 @@ HCL_EXPORT int hcl_conv_utf8_to_ucstr (
 );
 
 
-HCL_EXPORT hcl_oow_t hcl_uctoutf8 (
+HCL_EXPORT hcl_oow_t hcl_uc_to_utf8 (
 	hcl_uch_t    uc,
 	hcl_bch_t*   utf8,
 	hcl_oow_t    size
 );
 
-HCL_EXPORT hcl_oow_t hcl_utf8touc (
+HCL_EXPORT hcl_oow_t hcl_utf8_to_uc (
 	const hcl_bch_t* utf8,
 	hcl_oow_t        size,
 	hcl_uch_t*       uc
diff --git a/lib/utf8.c b/lib/utf8.c
index 5f56597..73a2eae 100644
--- a/lib/utf8.c
+++ b/lib/utf8.c
@@ -79,7 +79,7 @@ static HCL_INLINE __utf8_t* get_utf8_slot (hcl_uch_t uc)
 	return HCL_NULL; /* invalid character */
 }
 
-hcl_oow_t hcl_uctoutf8 (hcl_uch_t uc, hcl_bch_t* utf8, hcl_oow_t size)
+hcl_oow_t hcl_uc_to_utf8 (hcl_uch_t uc, hcl_bch_t* utf8, hcl_oow_t size)
 {
 	__utf8_t* cur = get_utf8_slot (uc);
 
@@ -106,7 +106,7 @@ hcl_oow_t hcl_uctoutf8 (hcl_uch_t uc, hcl_bch_t* utf8, hcl_oow_t size)
 	return (hcl_oow_t)cur->length;
 }
 
-hcl_oow_t hcl_utf8touc (const hcl_bch_t* utf8, hcl_oow_t size, hcl_uch_t* uc)
+hcl_oow_t hcl_utf8_to_uc (const hcl_bch_t* utf8, hcl_oow_t size, hcl_uch_t* uc)
 {
 	__utf8_t* cur, * end;
 
diff --git a/lib/utl.c b/lib/utl.c
index 9750a51..d4810ab 100644
--- a/lib/utl.c
+++ b/lib/utl.c
@@ -687,8 +687,8 @@ HCL_INLINE int hcl_conv_ucs_to_bcs_with_cmgr (
 
 static hcl_cmgr_t utf8_cmgr =
 {
-	hcl_utf8touc,
-	hcl_uctoutf8
+	hcl_utf8_to_uc,
+	hcl_uc_to_utf8
 };
 
 hcl_cmgr_t* hcl_get_utf8_cmgr (void)