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Last name Medellin (Medellin ) , throughout the world, is a common surname. The cognomen Medellin is habitual in Latin America and the Caribbean, particularly Mexico, where it is quite a common surname, Colombia, and Bolivia, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Mexico, Colombia, and the United States. Very seldom, Medellin is the forename as well as the last name.