Family name รัตนเจริญชัย (Rattanacharoenchai 
, รัตนเจริญชัย , Rattanaroengchai 
) , globally, is a rare surname. The family name รัตนเจริญชัย is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, รัตนเจริญชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ruttanacharoenchai, Rattanacharoenchai, รัตนเจริญชัย | Thailand |
| Rattanaroengchai | Thailand, United States |