Surname Seong-Sun (성순 
, Seong-Sun 
) , in the world, is an extremely rare family name. Much more frequently, Seong-Sun is the forename as well as the last name. Parts of the name also exists independently as a last name Seong, and a last name Sun.
| VARIANT | COUNTRY |
|---|---|
| 성순 | South Korea |
| Seong-Sun | United States |