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Worldwide, マサオ (Masao , マサオ ) is quite a rare primarily masculine, but very seldom girly first name. The given name マサオ is habitual in Japan, where it is quite a rare predominantly boy's, but very seldom feminine name, Trinidad and Tobago, where it is quite a rare male name, and Hong Kong, where it is a rare masculine name. In absolute terms, the name is most common in Japan, the United States, and China. More prevalently, マサオ is the last name as well as the forename.
マサオ is also a name for the fictitious and mythical characters: Masao Satō , the fictional character from Crayon Shin-chan and Masao Tachibana , the fictional human from Captain Tsubasa.