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Last name Crotty (كروتي , Crotty ) , all over the world, is quite a common surname. The family name Crotty is habitual in Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, it most frequently occurs in the United States, Ireland, and Australia. Much less frequently, Crotty is the forename as well as the last name.