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Around the world, Kumagai (クマガイ , Kumagai , くまがい) is a rare principally boy's, but scarcely feminine given name. The given name Kumagai is characteristic of Eastern Asia, particularly China, where it is a very rare predominantly masculine, but very seldom feminine name. Very seldom, Kumagai is the last name as well as the forename.
Kumagai is also a name for the fictitious and mythical characters: .