Cognomen Phaingchai (Phaingchai 
) , in the world, is an extremely rare last name. The family name Phaingchai is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Also, Phaingchai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phaingchai | Thailand |