Surname Jaeun (Jaeun 
, 자은 ) , throughout the world, is quite a rare family name. The family name Jaeun is characteristic of South Korea, where it is quite a rare surname, Cambodia, where it is a very rare surname, and Spain, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in South Korea, China, and Cambodia. Likewise, Jaeun is the forename as well as the last name.