Cognomen Khumtabtim (Khumtabtim 
) , across the world, is an extremely rare family name. The family name Khumtabtim is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khumtabtim | Thailand |
Phatchonon, and Phatchanon