Last name Loussouarn (Loussouarn 
) , throughout the world, is quite a rare cognomen. The surname Loussouarn is habitual in France, where it is quite a rare surname, Belarus, where it is a very rare surname, and Germany, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Loussouarn | Belarus, France, Germany |
| yvon loussouarn French jurist (b. 1923) |
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| véronique loussouarn French politician, FR (b. 1959) |
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| éric loussouarn French association football player, FR (b. 1974) |
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| christophe loussouarn researcher |
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| michel loussouarn French politician, FR (b. 1980) |
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| gildas loussouarn researcher |
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| kristell loussouarn |
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| delphine loussouarn |
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Mr, Aurã, Cathy, Betty, Boris, Bruno, Kevin, Ronan, Roger, Rémi, David, Diana, Diane, Laura, Laure, Laora, Louis, Loïc, Lucas, Julie, Théo, Nico', Andre, Allan, Alain, Maël, Ms, Mia, Gil, Lea, Lã, Marc, Alan, Anne, Paul, Rene, Erwan, Gwen, Joel, Jean, Naik, Eric, Hugo, Fred, Yann, Yves, Yvon, Marie, Léa, and Herve