Cognomen โรจนพงศ์ (โรจนพงศ์ 
, Rojanapong ) , throughout the world, is a very rare family name. The cognomen โรจนพงศ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, โรจนพงศ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| โรจนพงศ์, Rojanapong | Thailand |