Family name Phathanothai (Phathanothai 
) , in all the world, is a very rare cognomen. The last name Phathanothai is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phathanothai | United States, Thailand |
| sirin phathanothai (b. 1947) |
|