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Cognomen マスカワ (マスカワ ) , all over the world, is an extremely rare family name. Much more frequently, マスカワ is the forename as well as the last name.
Maskawa, Masukawa, 升川, and 益川
アイ, シナ, エリ, ユイ, タイキ, エリコ, and ケイスケ