Cognomen Thoasuwan (Thoasuwan 
) , in all the world, is a very rare family name. The last name Thoasuwan is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thoasuwan | Thailand |
Moragot, Danawan, and Natthanicha