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Cognomen Calero (Calero , Калеро , קלרו ) , in the entire world, is a common family name. The cognomen Calero is characteristic of Latin America and the Caribbean, particularly Nicaragua, where it is a common surname, Costa Rica, where it is quite a common surname, and Peru (explore the name in all countries). Measured by absolute frequency, the name is most common in Nicaragua, Spain, and Peru. Much less frequently, Calero is the forename as well as the last name.