Last name Koyuncu (Koyuncu 
, Коюнцу 
) , in the entire world, is a common family name. The last name Koyuncu is habitual in Turkey, where it is quite a common surname, Denmark, where it is quite a rare surname, and Austria. Not in comparison with a country's population, it is commonest in Turkey, Germany, and Denmark.
| VARIANT | COUNTRY |
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| Koyuncu | Belgium, Austria, Denmark, Turkey, Germany |
| Коюнцу | Russia |
| ahmet koyuncu Turkish politician, TR (b. 1922) |
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| haydar koyuncu Turkish politician, TR (b. 1925) |
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kemal koyuncu Turkish distance runner, TR (b. 1985) |
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| mehmet koyuncu botanist (b. 1944) |
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| serpil koyuncu TR (b. 1959) |
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| kâzım koyuncu Turkish singer, TR (b. 1971) |
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| erol koyuncu TR (b. 1966) |
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| ece koyuncu researcher (ORCID 0000-0002-0025-7397) |
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| emre koyuncu Ph.D. İstanbul Teknik Üniversitesi 2015 |
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| murat koyuncu researcher |
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| selcuk koyuncu Ph.D. Drexel University 2012 |
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| faik mumtaz koyuncu researcher (ORCID 0000-0002-0692-1340) |
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| seda koyuncu researcher |
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| ayse ceren calikoglu koyuncu researcher |
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| melik koyuncu researcher |
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