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Cognomen Aguinaga (Aguinaga , Aguiñaga ) , in all the world, is a common surname. The cognomen Aguinaga is characteristic of Latin America and the Caribbean, particularly Nicaragua, where it is quite a common surname, Peru, where it is quite a rare surname, and Uruguay. Measured by absolute frequency, it is the most numerous in Peru, Nicaragua, and the United States. Very seldom, Aguinaga is the forename as well as the last name.