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Cognomen Kajan (Kajan , Каян , Кажан ) , in all the world, is quite a common family name. The family name Kajan is characteristic of Slovakia, where it is quite a common surname, Armenia, and Qatar, where it is quite a rare surname. Measured by absolute frequency, the name is most common in Sri Lanka, Slovakia, and Ukraine. Also, Kajan is the forename as well as the last name.