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Surname Troye (Trui , Troye , טרוי ) , all over the world, is a rare cognomen. The last name Troye is characteristic of Norway, where it is quite a rare surname, Estonia, where it is a rare surname, and Israel. Measured by absolute frequency, the name is most common in Norway, the United States, and Sudan. Also, Troye is the forename as well as the last name.