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Surname Sertuäÿ (Sertuäÿ ) , globally, is an extremely rare cognomen. Much more frequently, Sertuäÿ is the forename as well as the last name.
Han, Sert, Demir, Yumak, Konrat, Toprak, Tokgöz, Altıntaş, Tanrıverdi, and Çetinkaya