Surname Yonsook (Yonsook 
) , globally, is a very rare family name. The last name Yonsook is habitual in Thailand, where it is a very rare surname, and China, where it is an extremely rare surname. Very seldom, Yonsook is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yonsook | Thailand, United States, China |