Surname รัตน์กุล (รัตน์กุล 
) , across the world, is an extremely rare cognomen. The last name รัตน์กุล is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much less frequently, รัตน์กุล is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| รัตน์กุล | Thailand |