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Last name Martt (Martt ) , around the world, is a very rare surname. The cognomen Martt is characteristic of the United States, where it is a very rare surname, the United Kingdom, and France, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Mexico. Also, Martt is the forename as well as the last name.