Family name Defourny (Defourny 
) , in all the world, is a rare last name. The family name Defourny is habitual in Western Europe, particularly Belgium, where it is quite a rare surname, Luxembourg, and Netherlands, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Western Europe, particularly Belgium, France, and Netherlands. Much less frequently, Defourny is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Defourny | Belgium, Netherlands, France, Germany, United States |
| pierre defourny (b. 1823) |
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| maurice defourny (b. 1878) |
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| michel defourny (b. 1944) |
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| jacques defourny professor of economics, BE (b. 1955) |
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| didier defourny Belgian racecar driver, BE (b. 1966) |
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| kyra a y defourny researcher (ORCID 0000-0002-1812-7013) |
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| samuel defourny BE |
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| lucienne defourny NL |
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| théo defourny Belgian association football player, BE (b. 1992) |
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| max defourny Belgian racing driver, BE (b. 1998) |
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Mr, Megan, Sarah, Steph, Boris, Bruno, Bruce, David, Louis, Luana, Jason, Julie, Thijs, Timmy, Fanny, Oscar, Marcel, Maxime, Michel, Miette, Samuel, Sabine, Marie, Eric, Theo, Jean, Ms, Max, Luc, Jos, J P, Tom, Marc, Mary, Stef, Anne, Simone, Adua, Roel, Rene, Rick, Dale, Gary, Greg, Grit, Lisa, Jaro, John, Paul, and Sylvia