Last name Yunja (윤자 
, Yunja 
) , all around the world, is a very rare surname. The last name Yunja is habitual in Malaysia, where it is a very rare surname, Germany, where it is an extremely rare surname, and the United States. Much more frequently, Yunja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| 윤자 | South Korea |
| Yunja | Germany, South Korea, United States, Colombia, Malaysia |