Family name Sanmun (Sanmun 
) , in all the world, is a very rare last name. The surname Sanmun is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much more prevalently, Sanmun is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sanmun | Thailand, India, Mexico, Malaysia |