Last name Seong-Dong (성동 
, Seong-Dong 
) , worldwide, is an extremely rare family name. The cognomen Seong-Dong is habitual in Northern America, particularly the United States, where it is an extremely rare surname. Much more prevalently, Seong-Dong is the forename as well as the last name. Parts of the name also exists independently as a last name Seong, and a last name Dong.