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Surname Erdélyi (Erdélyi , Erdelyi ) , throughout the world, is a common last name. The family name Erdélyi is characteristic of Hungary, where it is a common surname, Slovakia, where it is quite a rare surname, and Serbia. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Hungary, Slovakia, and Romania. Much less frequently, Erdélyi is the forename as well as the last name.