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Family name Olah (Olah , Oláh , 欧拉 ) , across the world, is a common last name. The family name Olah is characteristic of Eastern Europe, particularly Hungary, where it is a common surname, Slovakia, where it is quite a common surname, and Romania. Measured by absolute frequency, this name is the most popular in Hungary, Romania, and the United States. Much less frequently, Olah is the forename as well as the last name.