Cognomen Phonthongtin (Phonthongtin 
) , in all the world, is an extremely rare surname. The last name Phonthongtin is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phonthongtin | Thailand |
Bangon, Phiyanan, Thanavath, and Pattaranun