Cognomen ฤทธิมหา (ฤทธิมหา 
, Rutitmaha, Rithmaha) , worldwide, is a very rare family name. The family name ฤทธิมหา is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ritthimaha, ฤทธิมหา | Thailand |