Surname Gaillac (Gaillac 
) , globally, is a rare last name. The family name Gaillac is habitual in France, where it is quite a rare surname, Honduras, where it is a very rare surname, and the United States, where it is an extremely rare surname. In absolute terms, the name is most common in France, the United States, and Brazil. Much less frequently, Gaillac is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gaillac | France, Mexico, Brazil, United States, Honduras |
| georges gaillac railway worker, unionist and Resistance fighter, FR (b. 1906) |
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| laurent gaillac French rower, FR (b. 1950) |
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| josette gaillac French politician, FR (b. 1950) |
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| roland gaillac French rower, FR (b. 1966) |
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| romain gaillac researcher |
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| marie-laurence gaillac |
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Mr, Sonia, Alain, Bruno, Kevin, Paulo, Peggy, Roger, Ruddy, Denis, Debra, Danio, David, Louis, Lucas, Luiza, Jason, Julia, Julie, Tracy, Tyson, Erine, Serge, Marie, Yves, Hugo, Ms, Max, Ana, Bã, Pat, Xav, Marc, Stã, Alex, Anne, Henri, Paul, Debi, Dean, Gery, Loic, Ludo, Jose, Joã, Jean, Najo, Emma, Rick, and Fanny