Family name Koonchan (Koonchan 
) , in the world, is a very rare surname. The surname Koonchan is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Koonchan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koonchan | India, Thailand |
| koonchan kim Ph.D. Washington State University 1992 |
|