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All around the world, Кумагаи (Naozane , Kumagai , Кумагаи ) is a common male first name. The given name Кумагаи is habitual in Eastern Asia, particularly Japan, where it is quite a rare male name, and China, where it is a very rare primarily masculine, but scarcely girly name. Very seldom, Кумагаи is the last name as well as the forename.
Кумагаи is also a name for the fictitious and mythical characters: .