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Around the globe, Doujin (Doujin , 同人 ) is an extremely rare unknown gender forename. Very seldom, Doujin is the last name as well as the forename.
ドウジン, 兜金, 抖劲, 抖进, 斗劲, 斗斤, 斗进, 斗金, 豆金, 都金, and 都锦
Yi, Chen, and Zhang