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Worldwide, Koide (コイデ , Koide ) is a very rare dominantly boy's, but infrequently female first name. The forename Koide is habitual in China, where it is an extremely rare boy's name, and India, where it is an extremely rare female name. Much less frequently, Koide is the last name as well as the forename.
Koide is also a name for the fictitious and mythical characters: .