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Last name Leysen (Лейсен , 雷森 , Leysen ) , in the entire world, is quite a rare family name. The cognomen Leysen is characteristic of Western Europe, particularly Belgium, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Netherlands, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Belgium, Netherlands, and the United States. Very seldom, Leysen is the forename as well as the last name.