Family name พัย (Phai 
, พัย ) , all over the world, is quite a rare surname. The last name พัย is characteristic of South-eastern Asia, particularly Laos, where it is quite a rare surname, Malaysia, where it is a rare surname, and Myanmar. Not in comparison with a country's population, it most frequently occurs in India, Myanmar, and Laos. Also, พัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phai | Laos, Myanmar, Vietnam, India, Thailand |
| พัย | Thailand |