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Surname Székely (Szekely , Székely , Secui ) , throughout the world, is a common family name. The family name Székely is characteristic of Eastern Europe, particularly Hungary, where it is a common surname, Romania, where it is quite a common surname, and Slovakia, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Hungary, Romania, and the United States. Much less frequently, Székely is the forename as well as the last name.