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Family name Кумагаи (Naozane , Kumagai , Кумагаи ) , all around the world, is quite a rare surname. The surname Кумагаи is habitual in Singapore, where it is a rare surname, Japan, and Brazil. In absolute terms, it is commonest in Brazil, Japan, and the United States. More prevalently, Кумагаи is the forename as well as the last name.