Cognomen พัสตร์ (Phat 
, พัสตร์ , Phassarak ) , throughout the world, is quite a rare last name. The last name พัสตร์ is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname, Vietnam, and Malaysia, where it is a rare surname. More frequently, พัสตร์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phat | Vietnam, Laos, United States, Thailand, Myanmar |
| Phassarak, พัสตร์ | Thailand |