Cognomen Douj (Douj 
) , all around the world, is a very rare last name. The family name Douj is habitual in Algeria, where it is a rare surname, Morocco, where it is a very rare surname, and France, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Algeria, Morocco, and India. Very seldom, Douj is the forename as well as the last name.