Cognomen Gassiat (Gassiat 
) , all around the world, is a rare family name. The surname Gassiat is characteristic of France, where it is a rare surname, and the United States, where it is an extremely rare surname. Very seldom, Gassiat is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gassiat | United States, Spain, France |
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jean gassiat French golfer (1883-1946), FR (b. 1883) |
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| bernard gassiat FR (b. 1963) |
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| elisabeth gassiat Doctorate Université Paris-Sud XI - Orsay 1987 |
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| paul gassiat Ph.D. Université Paris Diderot - Paris 7 2011 |
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Paul, Jessica, Quentin, Maïthé, Caroline, Patricia, Philippe, Jacques, Laurence, Hélène, Valentin, Isabelle, Christian, Jean-Marc, Christiane, Juliette, Léonna, Georges, Ramuntcho, Jean, Alain, Brice, Henri, Samuel, Alexis, Carine, Benoit, Pierre, Romain, Robert, Melanie, Michele, Anthony, Bernard, Christophe, and Frédéric