Family name Seyhan (Seyhan 
, سيحان 
, Сеыхан 
) , in the entire world, is a common last name. The cognomen Seyhan is habitual in Turkey, where it is quite a common surname, Bulgaria, where it is quite a rare surname, and Germany, where it is a rare surname. In absolute terms, this name is the most popular in Turkey, Germany, and France. Also, Seyhan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Seyhan | Germany, France, Bulgaria, Saudi Arabia, Turkey |
| سيحان | Iraq, Yemen, Jordan, Iran |
| Сеыхан | Russia |
| mehmet necip seyhan Turkish politician, TR (b. 1917) |
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mukadder seyhan yücel Turkish academic, TR (b. 1971) |
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| tacidar seyhan Turkish politician, TR (b. 1959) |
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| kemal seyhan TR (b. 1960) |
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| sibel seyhan Turkish actress, TR (b. 1972) |
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| tolga seyhan Turkish footballer, TR (b. 1977) |
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| serhat seyhan researcher |
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| ahmet seyhan researcher |
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| nevra seyhan researcher |
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| sara l seyhan researcher |
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| attila a seyhan researcher ORCID ID = 0000-0003-1276-8466 |
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| ekrem cengiz seyhan researcher (ORCID 0000-0001-6639-2797) |
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| serdar seyhan researcher (ORCID 0000-0001-6813-1718) |
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| azade seyhan Fairbank Professor in the Humanities, Bryn Mawr College |
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| tülay özkan seyhan researcher |
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