Cognomen Sombunmak (Sombunmak 
) , in the entire world, is an extremely rare surname. The surname Sombunmak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sombunmak | Thailand |
Watsana, Yuwapha, and Kamolchanok