Surname Sungju (Sungju 
) , across the world, is a rare last name. The cognomen Sungju is habitual in South Korea, where it is a rare surname, China, where it is an extremely rare surname, and the United States. In absolute terms, this name is the most popular in South Korea, China, and India. More frequently, Sungju is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sungju | South Korea, France, China, United States, India |