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Last name Hierro (Heru , Yero , Hierro ) , all over the world, is a common cognomen. The last name Hierro is habitual in Marshall Islands, where it is a common surname, the Dominican Republic, where it is quite a common surname, and Indonesia, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Indonesia, Spain, and Nigeria. More prevalently, Hierro is the forename as well as the last name.