Surname Duplay (Duplay 
) , globally, is a rare cognomen. The cognomen Duplay is habitual in Luxembourg, where it is quite a rare surname, France, where it is a rare surname, and the United States, where it is a very rare surname. Very seldom, Duplay is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Duplay | United Kingdom, United States, India, France, Luxembourg |
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maurice duplay French carpenter, and revolutionary (1736-1820), FR (b. 1736) |
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éléonore duplay French revolutionary (1768-1832), FR (b. 1768) |
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| simon duplay French journalist, FR (b. 1774) |
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simon duplay French surgeon (1836-1924), FR (b. 1836) |
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maurice duplay French writer (1880-1978), FR (b. 1880) |
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| simon emmanuel duplay (b. 1836) |
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emmanuelle duplay French production designer, FR (b. 1965) |
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| éric duplay French politician, FR (b. 1957) |
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| joëlle duplay (b. 1956) |
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Mr, Alain, Carol, Couit, Kathy, Patti, David, Donna, Laure, Louis, Loïc, Lydie, Joris, Frank, Éric, Martin, Marcel, Michel, Muriel, Sylvie, Andrew, Angela, Orie, Arnaud, Fred, Eric, Ms, Su, Cã, Bob, Rod, Dã, Jim, Mark, Mike, Anna, Anne, Adam, Clã, Paul, Rene, Greg, Leon, John, Joel, Jodi, Jean, Enzo, and Adrien