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In the entire world, يين (Yin , Yeen , يين) is a common largely feminine, but uncommonly boy's forename. The first name يين is habitual in Eastern Asia, particularly Mongolia, where it is a prevalent predominantly girly, but scarcely male name, Hong Kong, where it is quite a common epicene name, and Macao. In absolute terms, it is the most numerous in Eastern Asia, particularly Mongolia, Hong Kong, and China. More frequently, يين is the last name as well as the forename.
يين is also a name for the fictitious and mythical characters: Yin Hong , the Investiture of the Gods character; Yin Susu , the character in wuxia fiction, The Heaven Sword and Dragon Saber; Yin Li , the character in wuxia fiction, The Heaven Sword and Dragon Saber and Yin , the character in Darker than Black.