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Surname كاسو (Kaso , Caso , Casso ) , around the globe, is a common cognomen. The surname كاسو is characteristic of Aland Islands, where it is quite a common surname, Albania, and Peru. Not in comparison with a country's population, it is the most numerous in Italy, Peru, and the United States. Much less frequently, كاسو is the forename as well as the last name.