Family name Suwasitthilak (Suwasitthilak 
) , throughout the world, is a very rare last name. The family name Suwasitthilak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Suwasitthilak | Thailand |
Phakanat, and Chanatpimon