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Worldwide, Maruo (Maruo , まるお) is a rare epicene first name. The forename Maruo is habitual in Egypt, where it is a rare male name, Brazil, where it is a very rare masculine name, and India, where it is a very rare principally feminine, but scarcely masculine name. In absolute terms, it is commonest in Egypt, India, and China. Likewise, Maruo is the last name as well as the forename.
Maruo is also a name for the fictitious and mythical characters: .