Family name ฤทธิรงศ์ (ฤทธิรงศ์ 
) , globally, is a very rare last name. The last name ฤทธิรงศ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, ฤทธิรงศ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิรงศ์ | Thailand |