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Last name Cadiz (Cadiz , Cádiz ) , worldwide, is a common family name. The last name Cadiz is habitual in Philippines, where it is quite a common surname, Chile, and Puerto Rico, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Philippines, Spain, and Chile. Very seldom, Cadiz is the forename as well as the last name.