Family name Seungyun (Seungyun 
) , throughout the world, is a rare last name. The family name Seungyun is characteristic of Malaysia, where it is a rare surname, South Korea, and Thailand, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Malaysia, South Korea, and China. More prevalently, Seungyun is the forename as well as the last name.