Cognomen Thayanin (Thayanin 
) , around the globe, is an extremely rare last name. The cognomen Thayanin is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More prevalently, Thayanin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thayanin | Thailand |
Phongphaew, and Rattanaphisit