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Cognomen Bierbaum (Bierbaum , Бирбаум ) , in the entire world, is quite a rare surname. The cognomen Bierbaum is characteristic of Austria, where it is quite a rare surname, Germany, and Denmark, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Germany, the United States, and Austria. Very seldom, Bierbaum is the forename as well as the last name.