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Last name Sœur (Ser , Sè , Sœur ) , around the globe, is a common cognomen. The family name Sœur is characteristic of Malaysia, where it is quite a common surname, Mongolia, and Algeria, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Algeria, Malaysia, and Myanmar. Also, Sœur is the forename as well as the last name.