Family name ไพฤทธิ์ (ไพฤทธิ์ 
, Pairit 
) , throughout the world, is a very rare last name. The last name ไพฤทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, Malaysia, where it is a very rare surname, and Philippines, where it is an extremely rare surname. Not in comparison with a country's population, it is the most numerous in Thailand, China, and Malaysia. More prevalently, ไพฤทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ไพฤทธิ์ | Thailand |
| Pairit | Philippines, Thailand, India, Malaysia, China |