Family name Demir (Demir 
, Демир 
, ديمير ) , in all the world, is a common cognomen. The last name Demir is characteristic of Turkey, where it is quite a common surname, Bosnia and Herzegovina, and North Macedonia (explore the name in all countries). In absolute terms, it is the most numerous in Turkey, Germany, and France. Much less frequently, Demir is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Demir | Germany, Austria, France, Iraq, Turkey |
| Демир | Bulgaria, Azerbaijan, Ukraine, Belarus, Russia |
| ديمير | Iraq |
| Дэмир | Belarus, Russia, Kazakhstan |
| demir vlonjati Albanian musician, AL (b. 1780) |
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| vehbi demir Turkish politician, TR (b. 1885) |
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| fatma demir woman executed by the Republic of Turkey (b. 1900) |
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orhan demir Canadian musician, CA (b. 1954) |
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fehmi demir Turkish politician (1957-2015), TR (b. 1957) |
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| demir turgut yola Turkish sailor, TR (b. 1909) |
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| ahmet demir TR (b. 1905) |
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vedat demir Turkish academician, writer, and journalist, TR (b. 1966) |
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| kemal demir Turkish politician, TR (b. 1921) |
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demir sabancı Turkish businessman, TR (b. 1971) |
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| demir zyko (b. 1911) |
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demir demirkan Turkish musician, TR (b. 1972) |
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demir yanev film producer and director, SY (b. 1972) |
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| ersin demir Turkish sailor, TR (b. 1922) |
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demir duric association football player, DE (b. 1976) |
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