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All over the world, サイン (Sine , サイン , 사인) is quite a common gender-neutral first name. The forename サイン is characteristic of Bhutan, where it is quite a common boy's name, Ethiopia, where it is quite a rare male name, and Denmark, where it is quite a rare girly name. Measured by absolute frequency, it is commonest in Ethiopia, India, and Mali. Likewise, サイン is the last name as well as the forename.