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Family name Traian (Traian , Траян ) , in the entire world, is quite a common cognomen. The family name Traian is habitual in Eastern Europe, particularly Romania, where it is quite a common surname, Moldova, where it is quite a rare surname, and Bulgaria. Measured by absolute frequency, it most frequently occurs in Romania, Bulgaria, and Spain. More frequently, Traian is the forename as well as the last name.