Last name Seongjin (Seongjin 
) , globally, is quite a rare surname. The surname Seongjin is habitual in South Korea, where it is quite a rare surname, Malaysia, where it is a very rare surname, and China, where it is an extremely rare surname. More frequently, Seongjin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Seongjin | South Korea, United States, Singapore, Malaysia, China |