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Cognomen Bayl (Bayl , Баил , Байль ) , all around the world, is a rare family name. The family name Bayl is habitual in Australia, where it is a rare surname, Kazakhstan, and Switzerland, where it is a very rare surname. In absolute terms, it is the most numerous in Australia, Russia, and Kazakhstan. Very seldom, Bayl is the forename as well as the last name.