Cognomen Tuncay (Tuncay 
, Тунджай 
) , across the world, is a common last name. The surname Tuncay 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 commonest in Turkey, Germany, and France. More prevalently, Tuncay is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tuncay | Germany, France, Azerbaijan, Turkey, Saudi Arabia |
| Тунджай | Ukraine, Bulgaria, Russia |
| ethem tuncay Turkish politician, TR (b. 1875) |
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| nezih tuncay Turkish actor, TR (b. 1945) |
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| i̇lker tuncay Turkish politician, TR (b. 1945) |
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| murat tuncay Turkish author, TR (b. 1948) |
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| ahmet tuncay Turkish judge, TR (b. 1963) |
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| i̇radə tuncay AZ (b. 1959) |
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| bəxtiyar tuncay AZ (b. 1960) |
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| fevzi tuncay Turkish footballer, TR (b. 1977) |
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| suat tuncay researcher |
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| esin tuncay researcher |
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| candan tuncay Ph.D. Iowa State University 2003 |
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| rabia mehtap tuncay researcher (ORCID 0000-0002-3510-5369) |
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| erkan tuncay researcher (ORCID 0000-0002-6675-2534) |
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| fulya yaylacioglu tuncay researcher |
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| fatma özkan tuncay researcher |
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Can, Demi R, Doğan, Güler, Yilmaz, Yildiz, Özkan, Özcan, Çakir, Çelik, Şahin, Bozkurt, Korkmaz, Yıldız, Yılmaz, Çeli K, Çeti N, Şahi N, Erdoğan, Yildirim, Özdemi R, Özdemir, Kiliç, Öztürk, Kaplan, Bayram, Acar, Kara, Kaya, Koç, Kurt, Gül, Uzun, Şen, Aslan, Aydin, Bulut, Polat, Demir, Turan, Tunç, Yaman, Yavuz, Özer, Arslan, Aktaş, Aydın, Karaca, and Yıldırım