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Surname Onay (Onay , Онай , وناي ) , worldwide, is a common cognomen. The family name Onay is characteristic of Turkey, where it is quite a common surname, Austria, where it is quite a rare surname, and Qatar, where it is a rare surname. In absolute terms, this name is the most popular in Turkey, Indonesia, and Germany. Much less frequently, Onay is the forename as well as the last name.