Surname Kahaja (Kahaja 
, Кахая 
) , throughout the world, is a rare last name. The family name Kahaja is habitual in Czechia, where it is a rare surname, Malaysia, where it is a very rare surname, and Russia, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Czechia, India, and Russia. Also, Kahaja is the forename as well as the last name.