Cognomen Oonyoung (Oonyoung 
) , in the world, is a very rare last name. The surname Oonyoung is habitual in Thailand, where it is a very rare surname, and China, where it is an extremely rare surname. Also, Oonyoung is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oonyoung | Thailand, China |