Cognomen Decq (Decq 
) , in all the world, is a rare last name. The last name Decq is characteristic of France, where it is a rare surname, Belgium, and Portugal, where it is a very rare surname. Much less frequently, Decq is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Decq | Portugal, France, Belgium, United States |
| adhémar decq 1850-1925; Decq, A.; Decq, Adhemar, FR (b. 1850) |
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| édouard decq French librarian and historian (1889-1915) (b. 1889) |
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odile decq French architect and academic, FR (b. 1955) |
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| françois decq FR (b. 1951) |
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| claude decq FR (b. 1951) |
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| françois decq FR (b. 1960) |
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Mr, Morgan, Michel, Alexis, Alyssa, Arnaud, Amalia, Carine, Celine, Cedric, Claude, Benoit, Kylian, Pascal, Pamela, Daniel, Damien, Didier, Gaelle, Gerard, Louise, Louisa, Morane, Maxime, Maryse, Marcel, Mã, Guy, Jã, Hã, Carl, Rene, Gael, Lili, Jean, Marie, Joevin, Kevin, Denis, David, Lydie, Jacky, Nancy, Erika, Hilde, Filip, Odile, Marthe, Regis, and Jerome