Family name Lefrancq (Lefrancq 
) , all over the world, is a rare cognomen. The surname Lefrancq is habitual in Belgium, where it is quite a rare surname, France, and Canada, where it is a very rare surname. Very seldom, Lefrancq is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lefrancq | Chile, Belgium, Canada, United States, France |
| charles françois joseph lefrancq French politician, FR (b. 1751) |
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| prosper lefrancq BE (b. 1808) |
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marcel g. lefrancq Belgian photographer (1916-1974), BE (b. 1916) |
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| adolphe lefrancq (b. 1871) |
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| auguste lefrancq (b. 1889) |
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| paul lefrancq French archivist and historian (1904-1984), FR (b. 1904) |
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| philippe lefrancq FR (b. 1958) |
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| véronique lefrancq Belgian politician, BE (b. 1972) |
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| gilles lefrancq FR (b. 1978) |
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| michel lefrancq BE |
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| f. lefrancq GB |
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Mr, Manon, Sandy, Sarah, Serge, Sonia, Alain, Allan, Andre, Annie, Adele, Agnes, Cathy, Bruno, Kacey, Kevin, Denis, David, Laura, Lorry, Louis, Loïc, Marie, Yves, Yann, Olga, Ms, Mã, Cã, Peg, Guy, Vã, Marc, Mels, Alex, Anne, Lucie, Axel, Paul, Rene, Rudy, Leny, Lisa, Léa, Jean, Theo, Eric, Hugo, Kaye, and Lucas