Cognomen ฤทธิญา (ฤทธิญา 
) , all around the world, is a very rare family name. The last name ฤทธิญา is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, ฤทธิญา is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิญา | Thailand |