Cognomen Rattanasimakul (Rattanasimakul 
) , in all the world, is a very rare surname. The last name Rattanasimakul is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Rattanasimakul | Thailand |
Komsan, Patcharee, Phattarika, and Phattaraporn