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Cognomen Mathy (Mathy , Мати , מאתי ) , in all the world, is quite a common last name. The last name Mathy is characteristic of Belgium, where it is quite a common surname, France, where it is quite a rare surname, and Sri Lanka. Not in comparison with a country's population, it is commonest in Belgium, France, and the Democratic Republic of the Congo. Likewise, Mathy is the forename as well as the last name.