Last name Üçüncü (Üçüncü 
) , throughout the world, is quite a common surname. The surname Üçüncü is characteristic of Western Asia, particularly Turkey, where it is quite a rare surname.
| VARIANT | COUNTRY |
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| Üçüncü | United States, Turkey |
| mehmet şükrü üçüncü Turkish politician, TR (b. 1869) |
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| şadi üçüncü Turkish-German writer (1948-2004), TR (b. 1948) |
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| bülent üçüncü Turkish footballer, TR (b. 1974) |
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| oğuz üçüncü TR (b. 1969) |
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| muhammed üçüncü researcher (ORCID 0000-0003-4638-1059) |
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| muhammed üçüncü researcher (ORCID 0000-0001-6200-9340) |
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| hasan üçüncü Turkish footballer, TR (b. 1980) |
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| sema i̇şisağ üçüncü researcher (ORCID 0000-0002-2739-4009) |
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| erkan üçüncü actor |
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| fatih üçüncü wrestler, TR (b. 1989) |
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Ali, Ayla, Ayse, Avni, Azmi, Cenk, Banu, Bade, Baki, Bora, Kaan, Ruhi, Gül, Jale, Taha, Nabi, Naci, Nuri, Elif, Esma, Esra, Eren, Atif, Erol, Akin, Adil, Can, Cem, Nur, Ela, Eda, Ece, Efe, Mert, Mine, Musa, Sami, Suna, Suat, Sena, Sema, Seda, Sefa, Arif, Arda, Arzu, Adem, Asli, and Erva