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Surname Troia (Troy , Trie , Troia ) , in all the world, is a common cognomen. The cognomen Troia is habitual in Jersey, where it is quite a common surname, Ireland, and Australia, where it is quite a rare surname. Measured by absolute frequency, the name is most common in the United States, Indonesia, and Italy. More frequently, Troia is the forename as well as the last name.