Cognomen Santhamat (Santhamat 
) , all around the world, is a very rare family name. The cognomen Santhamat is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Santhamat | Thailand |
Sompong, Kraiwanphanya, Natthakan, and Yutthasak