Cognomen Rattanaphong (รัตนพงศ์ 
, Rattanaphong 
) , throughout the world, is quite a rare last name. The cognomen Rattanaphong is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname. Likewise, Rattanaphong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| รัตนพงศ์ | Thailand |
| Rattanaphong | Thailand, United States |