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Family name Mariko (Mariko , マリコ , Марико ) , worldwide, is a widespread surname. The family name Mariko is habitual in Japan, where it is quite a common surname, Mali, and Equatorial Guinea, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Japan, Mali, and Ivory Coast. Much less frequently, Mariko is the forename as well as the last name.