Surname สมัญญาฤทธิ์ (สมัญญาฤทธิ์ 
) , in all the world, is an extremely rare family name. The last name สมัญญาฤทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, สมัญญาฤทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สมัญญาฤทธิ์ | Thailand |