Last name Kajr (Кайр 
, Kajr 
) , in all the world, is a very rare family name. The family name Kajr is habitual in Kazakhstan, where it is a very rare surname, Russia, where it is an extremely rare surname, and Canada. Measured by absolute frequency, the name is most common in Kazakhstan, Russia, and India. More frequently, Kajr is the forename as well as the last name.