Cognomen Thoun (Thoun 
) , globally, is a rare surname. The surname Thoun is habitual in South-eastern Asia, particularly Laos, where it is quite a rare surname, Myanmar, where it is a rare surname, and Cambodia, where it is a very rare surname. Measured by absolute frequency, it is commonest in Laos, Myanmar, and the United States. Also, Thoun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thoun | Laos, United States, France, Thailand, Myanmar |