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Surname Lahn (Lahn
, لاهن
) , globally, is quite a rare cognomen. The family name Lahn is habitual in Norway, where it is quite a rare surname, Germany, and Denmark, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Germany, the United States, and Norway. Also, Lahn is the forename as well as the last name.