Cognomen Niyomsart (Niyomsart 
) , across the world, is an extremely rare last name. The surname Niyomsart is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Niyomsart | Thailand |
Busaba, Wizarut, Suthasinee, and Buppachart