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Last name Birk (Birk , Burh , Бирк ) , in the world, is a common cognomen. The last name Birk is characteristic of Denmark, where it is quite a common surname, Estonia, and Germany, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Germany, India, and the United States. Very seldom, Birk is the forename as well as the last name.