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Throughout the world, まさお (Masao , まさお) is quite a rare principally boy's, but scarcely girly first name. The forename まさお is habitual in Japan, where it is quite a rare principally boy's, but very infrequently female name, Trinidad and Tobago, where it is quite a rare boy's name, and Hong Kong, where it is a rare masculine name. Not in comparison with a country's population, it most frequently occurs in Japan, the United States, and China. More prevalently, まさお is the last name as well as the forename.
まさお 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.