Last name Yonjoo (Yonjoo 
) , all over the world, is an extremely rare surname. The family name Yonjoo is habitual in Northern America, particularly the United States, where it is an extremely rare surname. Much more frequently, Yonjoo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yonjoo | South Korea, United States |