Last name รัตนเมธาโกศล (รัตนเมธาโกศล 
) , throughout the world, is a very rare family name. The surname รัตนเมธาโกศล is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| รัตนเมธาโกศล | Thailand |