Cognomen Kumagai (クマガイ 
, Kumagai 
, くまがい) , around the world, is quite a rare last name. The cognomen Kumagai is characteristic of Singapore, where it is a rare surname, Japan, and Brazil. Not in comparison with a country's population, it is commonest in Brazil, Japan, and the United States. More frequently, Kumagai is the forename as well as the last name.
| kumagai arinao (b. 1370) |
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| kumagai nobunao Japanese samurai (b. 1507) |
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| kumagai takanao (b. 1527) |
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| kumagai hirozane (b. 1538) |
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| kumagai motonao Christian samurai and martyr (b. 1555) |
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| naosada kumagai (b. 1575) |
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| shinʼemon kumagai (b. 1792) |
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| tsuneko kumagai (b. 1893) |
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| tsuneko kumagai (b. 1893) |
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| takeshi kumagai (b. 1907) |
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| sadao kumagai (b. 1908) |
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| hiromu kumagai (b. 1913) |
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| kojirō kumagai (b. 1941) |
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| fumie kumagai (b. 1943) |
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| denice kumagai American actress, US (b. 1956) |
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