Last name ฤทธิ์หิรัญ (ฤทธิ์หิรัญ 
) , in the world, is a very rare surname. The last name ฤทธิ์หิรัญ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, ฤทธิ์หิรัญ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิ์หิรัญ | Thailand |