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All around the world, Hisao (Hisao , デューク , ヒサオ ) is a rare male first name. The forename Hisao is habitual in Japan, where it is a rare male name, the United States, where it is a very rare masculine name, and Brazil, where it is an extremely rare boy's name. Not in comparison with a country's population, it is commonest in Japan, China, and the United States. More prevalently, Hisao is the last name as well as the forename.