Family name Phungsomsak (Phungsomsak 
) , in all the world, is a very rare cognomen. The cognomen Phungsomsak is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phungsomsak | Thailand |
Yok, Nipon, Ratthanan, and Napattakorn