Surname Khamthan (Khamthan 
) , across the world, is a very rare last name. The surname Khamthan is habitual in Thailand, where it is a very rare surname, and the United States, where it is an extremely rare surname. Also, Khamthan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Khamthan | India, United States, Thailand |