Family name Phatthanasak (Phatthanasak 
) , in the world, is a very rare cognomen. The cognomen Phatthanasak is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, Phatthanasak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phatthanasak | Thailand |