Cognomen Khuiaphai (Khuiaphai 
) , all around the world, is a very rare family name. The last name Khuiaphai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khuiaphai | Thailand |
Ubonwan, Dulyawit, and Peeradanai