Surname สุฤทธิ์ (Surit 
, สุฤทธิ์ , Somsanuk 
) , around the world, is quite a rare cognomen. The family name สุฤทธิ์ is habitual in Thailand, where it is quite a rare surname, Malaysia, where it is a very rare surname, and Mexico. Measured by absolute frequency, it is the most numerous in Thailand, India, and Indonesia. More prevalently, สุฤทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Surit | Thailand, India, Mexico, Indonesia, Malaysia |
| สุฤทธิ์ | Thailand |
| Somsanuk | Thailand, United States |