Family name Seung-Yoon (승윤 
, Seung-Yoon 
) , in all the world, is an extremely rare surname. Much more frequently, Seung-Yoon is the forename as well as the last name. Parts of the name also exists independently as a first name Seung, and a first name Yoon.
| VARIANT | COUNTRY |
|---|---|
| 승윤 | South Korea |
| Seung-Yoon | United States |