Last name Umsang (Umsang 
) , throughout the world, is a very rare family name. The cognomen Umsang is habitual in Thailand, where it is a very rare surname, and China, where it is an extremely rare surname. Likewise, Umsang is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Umsang | China, Thailand |