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Worldwide, まりこ (Mariko , まりこ) is quite a common epicene forename. The first name まりこ is characteristic of Mali, where it is quite a rare boy's name, Georgia, where it is quite a rare female name, and Japan. Not in comparison with a country's population, it most frequently occurs in Japan, the United States, and Mali. Likewise, まりこ is the last name as well as the forename.
まりこ is also a name for the fictitious and mythical characters: Mariko Yashida , the fictional character in Marvel Comics, The Wolverine; Mariko Kurama , the fictional character in Elfen Lied, manga by Lynn Okamoto and Mariko Konjo , the Fictional character in Ranma ½.