Family name Duplaix (Duplaix 
) , all around the world, is a rare cognomen. The cognomen Duplaix is habitual in France, where it is quite a rare surname, Australia, where it is a very rare surname, and Germany, where it is an extremely rare surname. Much less frequently, Duplaix is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Duplaix | Canada, Australia, France, Germany, United States |
| georges duplaix French painter and publisher (1895-1985), FR (b. 1895) |
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| michel duplaix French actor, FR (b. 1932) |
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| nicole duplaix French-American zoologist, US (b. 1943) |
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| vikter duplaix American musician, US (b. 1983) |
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| sophie duplaix |
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Mr, Bryan, Kevin, Roger, Denis, David, Louis, Loïc, Jacky, Eline, Vicky, Éric, Marion, Marcel, Maxime, Michel, Myriam, Samuel, Simone, Sylvie, Aurore, Carole, Bruno, Cindy, Andre, Alain, Ms, Axl, Guy, Marc, Mary, Stã, Anne, Adam, Clã, Paul, Celine, Rene, Lulu, Jean, Eric, Hugo, Yann, Yves, Marie, Samir, Serge, Steve, Ryan, and Claire