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Last name Knorr (Knorr , 诺尔 , Кнорр ) , in the world, is a common surname. The cognomen Knorr is characteristic of Germany, where it is quite a common surname, Paraguay, where it is quite a rare surname, and Austria. In absolute terms, it most frequently occurs in Germany, the United States, and Canada. Much less frequently, Knorr is the forename as well as the last name.