Family name รัตนพลธีร์ (รัตนพลธีร์ 
) , around the world, is an extremely rare cognomen. The family name รัตนพลธีร์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| รัตนพลธีร์ | Thailand |