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Last name Smain (Smain , سماعين , Smaïn ) , all over the world, is quite a rare family name. The surname Smain is characteristic of Algeria, where it is quite a rare surname, Morocco, where it is a rare surname, and Israel. Not in comparison with a country's population, it is commonest in Algeria, Morocco, and France. More frequently, Smain is the forename as well as the last name.