Cognomen Sompheng (Sompheng 
) , in all the world, is a rare last name. The surname Sompheng is habitual in Laos, where it is quite a rare surname, France, where it is a very rare surname, and Thailand, where it is an extremely rare surname. More prevalently, Sompheng is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sompheng | Laos, Thailand, United States, Canada, France |