Cognomen Niyomsumrouj (Niyomsumrouj 
) , globally, is a very rare last name. The family name Niyomsumrouj is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Niyomsumrouj is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Niyomsumrouj | Thailand |