Cognomen Sung-Kyu (성규 
, Sung-Kyu 
) , throughout the world, is a very rare family name. The cognomen Sung-Kyu is characteristic of Eastern Asia, particularly China, where it is an extremely rare surname. Predominantly, Sung-Kyu 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 Kyu.