Family name 卡佳 (Katja 
, 卡佳 
, Kajia 
) , in the world, is quite a rare last name. The cognomen 卡佳 is habitual in Slovenia, where it is quite a common surname, Liechtenstein, and North Macedonia, where it is quite a rare surname. In absolute terms, it is the most numerous in Tanzania, Slovenia, and Indonesia. Predominantly, 卡佳 is the forename as well as the last name.