Family name Phra Theerasak (Phra Theerasak 
) , in all the world, is an extremely rare cognomen. The family name Phra Theerasak is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Likewise, Phra Theerasak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phra Theerasak | Thailand |