Surname สมฤิทธิ์ (สมฤิทธิ์ 
) , across the world, is an extremely rare last name. The last name สมฤิทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Likewise, สมฤิทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สมฤิทธิ์ | Thailand |