Cognomen Sylwan (سيلوان 
, Силуан 
, Sylwan 
) , around the world, is a rare last name. The cognomen Sylwan is habitual in Sweden, where it is quite a rare surname, Poland, where it is a rare surname, and Argentina, where it is a very rare surname. Very seldom, Sylwan is the forename as well as the last name.
| VARIANT | COUNTRY |
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| سيلوان | Iraq |
| Силуан | Ukraine, Russia |
| Sylwan | Sweden, Italy, India, Poland, Argentina |
| jan sylwan IT (b. 1370) |
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otto sylwan Swedish writer, SE (b. 1864) |
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vivi sylwan SE (b. 1870) |
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eilif sylwan Swedish politician (1884-1972), SE (b. 1884) |
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mark sylwan Swedish artist (1914-1993), SE (b. 1914) |
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| george sylwan Swedish actor, SE (b. 1891) |
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| margareta sylwan (b. 1889) |
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| georg sylwan SE (b. 1891) |
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| åke sylwan SE (b. 1905) |
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| margareta sylwan SE (b. 1915) |
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| susanne sylwan SE (b. 1924) |
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| kari sylwan Swedish actress, SE (b. 1940) |
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| agneta sylwan (b. 1955) |
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| astrid sylwan Swedish artist and painter, SE (b. 1970) |
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| kerstin linnea sylwan SE (b. 1976) |
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Mr, Sigbrit, Anders, Annika, Astrid, Carlos, Dersim, Daniel, Guingo, Gunnar, Lucila, Viveca, Oskars, Zulema, Ulrika, Mathias, Mårten, Alberto, Augusto, Claudio, Kerstin, Patrice, Martin, Eskil, Tilde, Johan, Ana, Ida, Mats, Anna, Rosa, Greg, Lina, Nils, Elin, Erik, Rolando, Otto, Marta, Benno, Karin, Kicki, Paulo, Pawel, Peter, Peder, Diego, Lisen, Maria, and Gustavo