Last name รัตนธรรมวัฒน์ (รัตนธรรมวัฒน์ 
, Ratanathamwat , Rattanathamwat 
) , in the world, is a rare surname. The surname รัตนธรรมวัฒน์ is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ratanathamwat, รัตนธรรมวัฒน์ | Thailand |
| Rattanathamwat | United States, Thailand |