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Surname Cotto (Cotto , كوتو , Котто ) , globally, is a common last name. The surname Cotto is habitual in Latin America and the Caribbean, particularly Puerto Rico, where it is quite a common surname, Bolivia, and El Salvador, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in the United States, Puerto Rico, and Bolivia. Much less frequently, Cotto is the forename as well as the last name.