Surname Sonthuam (Sonthuam 
) , in the world, is a very rare family name. The cognomen Sonthuam is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Sonthuam | Thailand |
Orthai, Anuphon, Chumporn, and Pattarachai