Surname ฤทธิวงค์ (ฤทธิวงค์ 
) , throughout the world, is a rare cognomen. The family name ฤทธิวงค์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, ฤทธิวงค์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ฤทธิวงค์ | Thailand |