Cognomen รัตกูล (รัตกูล 
) , in the world, is a very rare family name. The cognomen รัตกูล is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, รัตกูล is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| รัตกูล | Thailand |