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Cognomen Erdelyi (Erdélyi , Erdelyi , Эрдели ) , in all the world, is a common family name. The surname Erdelyi is characteristic of Hungary, where it is a common surname, Slovakia, where it is quite a rare surname, and Serbia. In absolute terms, this name is the most popular in Eastern Europe, particularly Hungary, Slovakia, and Romania. Very seldom, Erdelyi is the forename as well as the last name.