Family name Jean-Sébastien (Jean-Sébastien 
) , worldwide, is a very rare cognomen. The last name Jean-Sébastien is characteristic of Belgium, where it is a rare surname, France, where it is a very rare surname, and Canada, where it is an extremely rare surname. Much more frequently, Jean-Sébastien is the forename as well as the last name. Parts of the name also exists independently as a first name Jean, and a first name Sébastien.
| VARIANT | COUNTRY |
|---|---|
| Jean-Sébastien | Luxembourg, France, Canada, Belgium, New Zealand |
Cyr, Fortin, Mercier, Bernard, Boucher, Bédard, Poirier, Richard, Grenier, Lacroix, Leclerc, Leblanc, Vallée, Ouellet, Cloutier, Bertrand, Beaulieu, Bouchard, Gauthier, Gosselin, Lefebvre, Tremblay, Nadeau, Lévesque, Lavoie, Landry, Roy, Roux, Guay, Joly, Morin, Caron, Blanc, Blais, Rioux, Denis, Turcotte, Lebel, Martel, Moreau, Michel, Côté, Plante, Renaud, Dubois, Gagnon, Gagné, Girard, Noël, and Fournier