Surname Khadja (Khadja 
, Хаджа 
, Хадя ) , across the world, is a rare family name. The cognomen Khadja is characteristic of Morocco, where it is a rare surname, Kyrgyzstan, and Algeria, where it is a very rare surname. In absolute terms, it most frequently occurs in Morocco, Nigeria, and Algeria. More prevalently, Khadja is the forename as well as the last name.