Family name Khamdet (Khamdet 
) , throughout the world, is a very rare cognomen. The surname Khamdet is habitual in Thailand, where it is a very rare surname, France, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Thailand, France, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Khamdet | United Kingdom, United States, Thailand, France |