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Family name Hisao (Hisao , デューク , ヒサオ ) , all around the world, is a common surname. The surname Hisao is habitual in Japan, where it is quite a rare surname, China, where it is a very rare surname, and Spain. Measured by absolute frequency, it is the most numerous in Japan, China, and the United States. Very seldom, Hisao is the forename as well as the last name.