Cognomen Seillier (Seillier 
) , across the world, is quite a rare surname. The surname Seillier is characteristic of Western Europe, particularly France, where it is quite a rare surname, Belgium, where it is a rare surname, and Switzerland. Much less frequently, Seillier is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Seillier | Canada, Switzerland, Belgium, United States, France |
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alice seillier French basketball player (1932-), FR (b. 1932) |
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| daniel seillier FR (b. 1926) |
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| bernard seillier French politician and official, FR (b. 1941) |
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| françoise seillier French politician, FR (b. 1945) |
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| claude seillier (b. 1935) |
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| erick seillier French politician, FR (b. 1951) |
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| bruno seillier French screenwriter and film director, FR (b. 1974) |
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| lancelot seillier researcher |
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| alexandre seillier researcher (ORCID 0000-0003-1859-2561) |
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| marion seillier researcher |
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| laurent seillier |
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| rodrigue seillier |
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Mr, Luna, Lulu, Léo, Léa, Joel, Jean, Elsa, Eric, Erik, Enry, Emma, Fred, Frã, Yann, Yves, Marie, Mehdi, Sandy, Shade, Serge, Sonia, Lily, Rudy, Remi, Rene, Ms, Sue, Seb, Ben, Guy, Leo, Lou, Lã, Jã, Tom, Alain, Marc, Malo, Maud, Mely, Stã, Alex, Anne, Aude, Axel, Karl, Paul, Manu, and Anais