Cognomen Ducoin (Ducoin 
) , around the world, is quite a rare family name. The cognomen Ducoin is habitual in France, where it is quite a rare surname, Belgium, where it is a rare surname, and Argentina, where it is a very rare surname. In absolute terms, the name is most common in France, the United States, and Argentina. Much less frequently, Ducoin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ducoin | Belgium, Argentina, United States, Mexico, France |
| marie-auguste ducoin FR (b. 1815) |
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| jacques ducoin French author, FR (b. 1939) |
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| david ducoin French photographer, director, guide and lecturer, FR (b. 1950) |
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| jean-emmanuel ducoin French journalist, FR (b. 1966) |
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| marylène ducoin French author and lecturer, FR |
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| christopher ducoin researcher |
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| julie ducoin French politician, FR (b. 1985) |
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Mr, Jean, Tony, Nina, Eric, Hawa, Hugo, Otto, Maria, Marie, Marta, Manon, Maggy, Sarah, Sacha, Serge, Scott, Alice, Aline, Alain, Andre, Anais, Joel, Jani, Léa, Léo, Ms, Ed, Cã, Bob, Pat, Guy, Luc, Jon, Joy, Jul, Angie, Jã, Mary, Mark, Saul, Stã, Anne, Aude, Bill, Paul, Dave, Lucy, Marc, and Cathy