Last name Youngsung (Youngsung 
) , in the entire world, is a rare family name. The family name Youngsung is characteristic of South Korea, where it is a rare surname, Thailand, where it is an extremely rare surname, and China. More prevalently, Youngsung is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Youngsung | China, South Korea, Thailand, United States, Canada |