Cognomen Petsangwan (Petsangwan 
) , all around the world, is a very rare last name. The cognomen Petsangwan is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Petsangwan | Thailand |
Samang, Sophon, Kanyanat, Hutsanai, and Pitchayapa