Surname Theanseng (Theanseng 
) , in all the world, is an extremely rare family name. The cognomen Theanseng is characteristic of South-eastern Asia, particularly Cambodia, where it is a very rare surname, and Thailand, where it is an extremely rare surname. Very seldom, Theanseng is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Theanseng | Thailand, Cambodia, Malaysia |