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Family name Reg (Reg , 雷格 , ريج ) , all over the world, is quite a rare surname. The family name Reg is habitual in Liechtenstein, where it is quite a common surname, Algeria, where it is quite a rare surname, and Morocco. Not in comparison with a country's population, it is commonest in Algeria, Indonesia, and Morocco. More prevalently, Reg is the forename as well as the last name.