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Across the world, 사인 (Sine
, サイン
, 사인) is quite a common epicene first name. The first name 사인 is characteristic of Bhutan, where it is quite a common masculine name, Ethiopia, where it is quite a rare male name, and Denmark, where it is quite a rare female name. Measured by absolute frequency, it is the most numerous in Ethiopia, India, and Mali. Also, 사인 is the last name as well as the forename.