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Surname Troit (Troit ) , all around the world, is a very rare cognomen. The surname Troit is characteristic of France, where it is a very rare surname, Israel, and the United States, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in the United States, France, and the United Kingdom. Very seldom, Troit is the forename as well as the last name.