Cognomen Somoun (Somoun 
) , in the world, is an extremely rare last name. The family name Somoun is habitual in South-eastern Asia, particularly Cambodia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Likewise, Somoun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Somoun | Thailand, United States, Cambodia, Malaysia |