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Cognomen Halfi (Halfi , חלפי ) , across the world, is a rare surname. The cognomen Halfi is habitual in Mauritania, where it is quite a rare surname, Morocco, and Israel, where it is a rare surname. Not in comparison with a country's population, the name is most common in Morocco, Indonesia, and Mauritania. Very seldom, Halfi is the forename as well as the last name.