Cognomen Somwaeng (Somwaeng 
) , around the globe, is a very rare last name. The family name Somwaeng is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Somwaeng is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Somwaeng | Thailand |
Ratree, Pitiwat, Sithidol, Prapasap, and Samatthaphong