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Cognomen Tumas (Tumas , Тумас , טומאס ) , globally, is quite a rare surname. The cognomen Tumas is habitual in Lithuania, where it is quite a common surname, Belarus, where it is quite a rare surname, and Armenia. Not in comparison with a country's population, it is the most numerous in Lithuania, Belarus, and the United States. Much less frequently, Tumas is the forename as well as the last name.