Cognomen ฤทธิ์สุธีทร (ฤทธิ์สุธีทร 
) , around the globe, is a very rare family name. The family name ฤทธิ์สุธีทร is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิ์สุธีทร | Thailand |