Last name Kajahan (Kajahan 
, Каяхан 
) , in the entire world, is a very rare surname. The last name Kajahan is characteristic of Kyrgyzstan, where it is a very rare surname, Russia, where it is an extremely rare surname, and Germany. In absolute terms, it is the most numerous in Russia, India, and Germany. Very seldom, Kajahan is the forename as well as the last name.