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Family name Caldero (Caldero , Kaldero ) , in the world, is quite a rare cognomen. The last name Caldero is characteristic of Latin America and the Caribbean, particularly Puerto Rico, where it is quite a rare surname, Bolivia, and Cuba, where it is a rare surname. In absolute terms, it most frequently occurs in the United States, Puerto Rico, and Spain. Much less frequently, Caldero is the forename as well as the last name.