Last name รัตนพงศ์กุล (รัตนพงศ์กุล 
) , in the entire world, is a very rare cognomen. The cognomen รัตนพงศ์กุล is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| รัตนพงศ์กุล | Thailand |