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Surname Thiry (西里 , Thiry , Тири) , globally, is quite a common cognomen. The family name Thiry is characteristic of Western Europe, particularly Luxembourg, where it is quite a common surname, Belgium, and France, where it is quite a rare surname. Measured by absolute frequency, it most frequently occurs in Belgium, France, and the United States. Much less frequently, Thiry is the forename as well as the last name.