Cognomen Yeon-Ok (연옥 
, Yeon-Ok 
) , all around the world, is an extremely rare surname. Much more prevalently, Yeon-Ok is the forename as well as the last name. Parts of the name also exists independently as a last name Yeon, and a last name Ok.
| VARIANT | COUNTRY |
|---|---|
| 연옥 | South Korea |
| Yeon-Ok | Canada, United States |