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Cognomen Vayl (Ваил , Vayl , Вайль ) , in the world, is a rare family name. The cognomen Vayl is characteristic of Russia, where it is a very rare surname, Kazakhstan, and Kyrgyzstan. Measured by absolute frequency, the name is most common in Russia, the United States, and India. Much less frequently, Vayl is the forename as well as the last name.