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Globally, Seiun (Seiun
, 星雲
) is a very rare unisex forename. The given name Seiun is characteristic of Eastern Asia, particularly China, where it is an extremely rare gender-neutral name. Very seldom, Seiun is the last name as well as the forename.
Seiun is also a name for the fictitious and mythical characters: Seiun Sky , the fictional character from Uma Musume Pretty Derby.