Surname Phomsak (พรมศักดิ์ 
, Phomsak ) , all around the world, is a rare cognomen. The family name Phomsak is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, Phomsak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พรมศักดิ์, Phomsak | Thailand |