proper noun/va.jɑ̃.kuʁ/
Vaillancourt: a habitational surname from placenames
Related: le Vailland, Le Vailland, Le Vaillant, le Vaillant, LeVailland, Levailland, Levaillant, LeVaillant, Vailand, Vailant
Inherited from Old French Villencourt, from the Abbey of Villencourt (Abbaye de Villencourt), from ville+en+court, from being the location where Count William of Ponthieu held court in Thurn, on land belonging to Guillaume D'Abberville where the abbey was.