Family name Phaohuasa (Phaohuasa 
) , worldwide, is an extremely rare surname. The cognomen Phaohuasa is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phaohuasa | Thailand |
Onsucha, Arunrat, Tuanjai, Teerakan, and Kodchakorn