Family name รุ่งถาวร (รุ่งถาวร, Rungtavorn 
) , throughout the world, is a very rare last name. The surname รุ่งถาวร is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rungtavorn | Thailand |
Rungthavorn, and Rungthaworn