Surname Youngsook (Youngsook 
) , in the world, is a rare cognomen. The last name Youngsook is characteristic of South Korea, where it is a rare surname, Thailand, where it is a very rare surname, and Chile, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in South Korea, China, and Thailand. Likewise, Youngsook is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Youngsook | China, United States, Thailand, Canada, South Korea |