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.