Cognomen 용재 (Yongjae 
, 용재 , Yong-Jae 
) , in all the world, is a rare family name. The cognomen 용재 is habitual in South Korea, where it is a rare surname, Malaysia, where it is a very rare surname, and China, where it is an extremely rare surname. Much more frequently, 용재 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yongjae | South Korea, Malaysia, China, Canada, United States |
| 용재 | South Korea |
| Yong-Jae | Canada, Germany, United States, South Korea |