Family name โรจนฤทธิ์ (โรจนฤทธิ์ 
) , worldwide, is an extremely rare surname. The last name โรจนฤทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more frequently, โรจนฤทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| โรจนฤทธิ์ | Thailand |