Surname Phaingruethai (Phaingruethai 
) , around the globe, is an extremely rare last name. The surname Phaingruethai is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, Phaingruethai is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phaingruethai | Thailand |