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Cognomen Keyn (เคน , Keyn
, Кейн
) , around the globe, is a rare family name. The surname Keyn is habitual in Tajikistan, where it is quite a rare surname, Norway, where it is a rare surname, and Bulgaria. Not in comparison with a country's population, it is the most numerous in Tajikistan, Russia, and Indonesia. More frequently, Keyn is the forename as well as the last name.