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Surname 윤 (Yun , Yoon , 允 , along with others...) , in all the world, is a widespread family name. The cognomen 윤 is habitual in South Korea, where it is a widespread surname, Malaysia, where it is a common surname, and Myanmar (explore the name in all countries). Measured by absolute frequency, it is the most numerous in South Korea, Malaysia, and China. Also, 윤 is the forename as well as the last name.