Surname Khiaopaen (Khiaopaen 
) , all around the world, is a very rare family name. The cognomen Khiaopaen is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Khiaopaen | Thailand |
Kokiet, Rattiya, Thitiya, Thanchanok, and Patchareeporn