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Surname Ersoy (Ersoy , Эрсой , Ерсой , and others...) , in all the world, is a common cognomen. The cognomen Ersoy is characteristic of Turkey, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Austria. In absolute terms, it is the most numerous in Turkey, Germany, and Austria. Very seldom, Ersoy is the forename as well as the last name.