Cognomen Khamphonsaen (Khamphonsaen 
) , in the entire world, is a very rare last name. The family name Khamphonsaen is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khamphonsaen | Thailand |
Phitun, Thiraon, and Paphawarin