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Cognomen Leyfer (Leyfer
, Лейфер
) , throughout the world, is a rare surname. The cognomen Leyfer is habitual in Russia, where it is a very rare surname, Ukraine, and Kazakhstan. Not in comparison with a country's population, it is commonest in Russia, the United States, and Ukraine. Very seldom, Leyfer is the forename as well as the last name.