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Family name Crosby (Crosby , Кросби , קרוסבי ) , around the world, is a common last name. The surname Crosby is characteristic of Grenada, where it is quite a common surname, the United States, and Trinidad and Tobago. In absolute terms, it is commonest in the United States, the United Kingdom, and Canada. Much less frequently, Crosby is the forename as well as the last name.