Last name Sung-Jae (성재 
, Sung-Jae 
) , in all the world, is an extremely rare surname. The family name Sung-Jae is characteristic of Northern America, particularly the United States, where it is an extremely rare surname. Much more prevalently, Sung-Jae is the forename as well as the last name. Parts of the name also exists independently as a last name Sung, and a first name Jae.