Family name โอมฤทธิ์ (Aummarit 
, Aumarit 
, Ommarit ) , globally, is a very rare last name. The surname โอมฤทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, โอมฤทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ommarit, โอมฤทธิ์, Aummarit | Thailand |
| Aumarit | India, Thailand |