Surname Ounsaeng (Ounsaeng 
) , in all the world, is a very rare last name. The surname Ounsaeng is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Ounsaeng is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ounsaeng | United States, Thailand |