Cognomen 재준 (Jaejun 
, 재준 , Jae-Joon 
) , worldwide, is a very rare surname. The cognomen 재준 is habitual in Cambodia, where it is a very rare surname, and China, where it is an extremely rare surname. Much more frequently, 재준 is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jaejun | China, South Korea, Singapore, Cambodia, United States |
| 재준 | South Korea |
| Jae-Joon | France, South Korea, United States |