Surname Yooin (Yooin 
) , around the globe, is a rare cognomen. The surname Yooin is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. Also, Yooin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Yooin | South Korea, Malaysia, United States, Thailand |