Bellavance is a surname. Notable people with the surname include:
The origins of this name can be found on this website: www.gagnier.org
It is descended from a member of the Gagne family, Pierre 1610-1656) who immigrated from France to Ste. Anne de Beaupre Quebec in 1653.The original spelling was Gasnier, later spelled Gagnier, Gagne and many other variations.
Louis, third son of Pierre, obtained a title of Signeur as Lord of the Fresnaye and with it a new name, Bellavance.He chose to give his property at Cap-Saint-Ignace the name La Fresnayeafter a manor located near his former village in France.He is the ancestor of the Bellavance line in Quebec.