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Family name Kayl (Kayl , Кайл , Каил ) , across the world, is a rare last name. The cognomen Kayl is characteristic of Luxembourg, where it is quite a rare surname, Bulgaria, and Romania, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in the United States, Russia, and Bulgaria. Very seldom, Kayl is the forename as well as the last name.