Cognomen Sefen (Sefen 
) , across the world, is a rare last name. The surname Sefen is habitual in Egypt, where it is a rare surname, Greece, where it is a very rare surname, and Germany, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Egypt, Greece, and the United States. Also, Sefen is the forename as well as the last name.