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Family name Arns (ارنس , Arns , Арнс) , throughout the world, is quite a rare surname. The surname Arns is characteristic of Germany, where it is quite a rare surname, Netherlands, where it is a rare surname, and New Zealand. In absolute terms, it is the most numerous in Germany, the United States, and Brazil. Much less frequently, Arns is the forename as well as the last name.