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Surname Haydu (Hajdú , Haydu ) , around the globe, is quite a rare family name. The family name Haydu is characteristic of Eastern Europe, particularly Hungary, where it is quite a rare surname, Romania, where it is a rare surname, and Slovakia. Measured by absolute frequency, this name is the most popular in the United States, Hungary, and Romania. Much less frequently, Haydu is the forename as well as the last name.