Cognomen Oyku (Oyku 
) , globally, is a very rare last name. The family name Oyku is habitual in Western Asia, particularly Turkey, where it is a very rare surname. More frequently, Oyku is the forename as well as the last name.
Su, Esmer, Hanna, Ozcan, Ozsoy, Uysal, Arslan, Celebi, Keskin, Dincer, Duman, Gurman, Ozturk, Yilmaz, Yildiz, Celilov, Burnett, Karayel, Demirel, Asikoglu, Buyukdere, Tugrul, Duran, Dogan, Demir, Ak, Ay, Sen, Can, Ayaz, Acar, Kaya, Isik, Unal, Sahin, Altom, Akyol, Aydin, Celik, Cicek, Civan, Barut, Benli, Bulut, Kilic, Deniz, Yildirim, and Bonnafoux