Cognomen Phiwat (พิวัฒน์ 
, ภิวัฒน์ , Phiwat 
) , globally, is a very rare family name. The surname Phiwat is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. More frequently, Phiwat is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ภิวัฒน์, พิวัฒน์ | Thailand |
| Phiwat | United States, Thailand, India |