Cognomen Niyomtam (Niyomtam 
) , in the entire world, is a very rare last name. The last name Niyomtam is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Niyomtam | Thailand |
Sarisa, Santiwat, Nutjaree, Varaporn, and Narongdace