Last name ฤทธิ์อุยานนท์ (ฤทธิ์อุยานนท์ 
) , all over the world, is a very rare cognomen. The family name ฤทธิ์อุยานนท์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิ์อุยานนท์ | Thailand |