Cognomen Phornsuwan (Phornsuwan 
) , in all the world, is a very rare family name. The surname Phornsuwan is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Phornsuwan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phornsuwan | United States, Thailand |