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Cognomen Seylan (Seylan , Сейлан , Сеылан ) , in all the world, is quite a rare last name. The last name Seylan is habitual in Turkey, where it is quite a rare surname, Netherlands, where it is a very rare surname, and Kyrgyzstan. Not in comparison with a country's population, it most frequently occurs in Turkey, Germany, and Russia. Likewise, Seylan is the forename as well as the last name.