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Last name Erdei (Erdei
, Эрдеи, Эрдей
) , throughout the world, is a common family name. The surname Erdei is habitual in Hungary, where it is quite a common surname, Romania, and Serbia, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Hungary, Romania, and the United States. Very seldom, Erdei is the forename as well as the last name.