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Last name Rosky (Rosky ) , all around the world, is a rare surname. The surname Rosky is characteristic of Isle of Man, where it is quite a rare surname, Austria, where it is a rare surname, and Germany, where it is a very rare surname. Measured by absolute frequency, the name is most common in the United States, Germany, and Indonesia. More frequently, Rosky is the forename as well as the last name.