Family name Phiwngoen (Phiwngoen 
) , around the globe, is a very rare surname. The last name Phiwngoen is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phiwngoen | Thailand |
Piyanud, Warisara, Thanathep, and Thitichaya