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Cognomen Leutnant (Lieutenant , Leutnant ) , in the world, is a rare surname. The cognomen Leutnant is habitual in Western Europe, particularly Luxembourg, where it is quite a rare surname, Belgium, and Germany, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Western Europe, particularly Germany, Belgium, and France. Also, Leutnant is the forename as well as the last name.