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Surname Casadei (Casadei
, Казадеи) , all over the world, is a common last name. The surname Casadei is characteristic of San Marino, where it is a widespread surname, Italy, where it is quite a common surname, and Argentina, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Italy, Brazil, and Argentina. Much less frequently, Casadei is the forename as well as the last name.