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Family name Luhn (Лун
, Luhn
) , throughout the world, is quite a rare last name. The cognomen Luhn is habitual in Germany, where it is quite a rare surname, Austria, where it is a rare surname, and Kyrgyzstan. In absolute terms, it is commonest in Germany, the United States, and Russia. Much less frequently, Luhn is the forename as well as the last name.