Surname Chiahuan (Chiahuan 
) , across the world, is a rare family name. The surname Chiahuan is characteristic of Taiwan, where it is a rare surname, and Thailand, where it is a very rare surname. Very seldom, Chiahuan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Chiahuan | Taiwan, United States, Thailand |