Cognomen 자윤 (Jayun 
, 자윤 , Ja-Yoon) , globally, is a rare last name. The last name 자윤 is characteristic of Malaysia, where it is a rare surname, South Korea, and New Zealand, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in South Korea, Malaysia, and Nigeria. More frequently, 자윤 is the forename as well as the last name.