Cognomen Chaja (Chaja 
, Чая 
) , in the entire world, is a rare surname. The family name Chaja is habitual in Botswana, where it is quite a rare surname, Poland, where it is a rare surname, and Ukraine, where it is a very rare surname. In absolute terms, it most frequently occurs in Poland, Russia, and Pakistan. Also, Chaja is the forename as well as the last name.