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Family name Stefanu (Stefanu , Стефану , סטפנוס ) , all over the world, is a very rare last name. The family name Stefanu is characteristic of Bulgaria, where it is a rare surname, Greece, where it is a very rare surname, and Argentina. Measured by absolute frequency, it most frequently occurs in the United States, Argentina, and Bulgaria. Also, Stefanu is the forename as well as the last name.