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Last name Kayna (Kayna , Каина , كاينا ) , in the world, is a rare cognomen. The family name Kayna is characteristic of Morocco, where it is quite a rare surname, Algeria, where it is a rare surname, and France, where it is a very rare surname. In absolute terms, it is the most numerous in Morocco, Russia, and Indonesia. Also, Kayna is the forename as well as the last name.