Cognomen Thongkhien (Thongkhien 
) , in the world, is a very rare family name. The last name Thongkhien is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Thongkhien is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Thongkhien | United States, Thailand |