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Cognomen サイトウ (サイトウ , Saito , Saitou ) , around the globe, is a common family name. The cognomen サイトウ is habitual in Japan, where it is quite a rare surname, Brazil, and Singapore. In absolute terms, it is the most numerous in Brazil, Japan, and the United States. More frequently, サイトウ is the forename as well as the last name.