Family name รุจนพงศ์ (รุจนพงศ์ 
) , in the entire world, is an extremely rare cognomen. The last name รุจนพงศ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, รุจนพงศ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| รุจนพงศ์ | Thailand |