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Family name Stirn (Stirn ) , in all the world, is quite a rare cognomen. The last name Stirn is habitual in Slovenia, where it is quite a common surname, Luxembourg, where it is quite a rare surname, and Germany, where it is a rare surname. In absolute terms, the name is most common in Germany, the United States, and Slovenia. Much less frequently, Stirn is the forename as well as the last name.