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Family name Croy (Croy , קרוי , 克罗伊) , all around the world, is quite a common cognomen. The last name Croy is characteristic of New Zealand, where it is quite a rare surname, the United States, and Austria, where it is a rare surname. In absolute terms, it is the most numerous in the United States, South Africa, and the United Kingdom. Much less frequently, Croy is the forename as well as the last name.