Cognomen Khamhoon (Khamhoon 
) , around the world, is an extremely rare last name. The surname Khamhoon is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khamhoon | Thailand |
Monnapat, Kreangsak, Napassawan, and Boonnamsilp