Family name Jae-Yoon (재윤 
, Jae-Yoon 
) , in all the world, is a very rare cognomen. The cognomen Jae-Yoon is habitual in Eastern Asia, particularly China, where it is an extremely rare surname. Much more frequently, Jae-Yoon is the forename as well as the last name. Parts of the name also exists independently as a first name Jae, and a first name Yoon.