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Cognomen Быкаў (Bykov , Быкаў , Bykau ) , in all the world, is quite a rare surname. The last name Быкаў is habitual in Estonia, where it is quite a rare surname, Lithuania, and Israel. Measured by absolute frequency, this name is the most popular in Russia, Israel, and the United States. Very seldom, Быкаў is the forename as well as the last name.