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Surname Caso (Caso , كاسو , 卡索 ) , all over the world, is a common cognomen. The family name Caso is habitual in Aland Islands, where it is quite a common surname, Peru, and Italy, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Italy, Peru, and the United States. Much less frequently, Caso is the forename as well as the last name.