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Cognomen Kenja (Кенжа , Kenja , Кенйа ) , throughout the world, is a rare last name. The cognomen Kenja is habitual in Kyrgyzstan, where it is a rare surname, Ukraine, and Belarus. Measured by absolute frequency, it is the most numerous in Ukraine, Russia, and Tanzania. Likewise, Kenja is the forename as well as the last name.