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In all the world, Sieun (Sieun
, 시은
) is quite a rare epicene given name. The forename Sieun is characteristic of South Korea, where it is quite a rare gender-neutral name, the United States, where it is an extremely rare epicene name, and China, where it is an extremely rare boy's name. Much less frequently, Sieun is the last name as well as the forename.