Family name Niyomsak (Niyomsak 
) , around the world, is a very rare cognomen. The family name Niyomsak is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, Niyomsak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Niyomsak | Thailand |