Saint-Louis-de-Montferrand is a commune in the Gironde department in the Nouvelle-Aquitaine region in Southwestern France. Origin of the …Saint-Louis-de-Montferrand is a commune in the Gironde department in the Nouvelle-Aquitaine region in Southwestern France. Origin of the name: from the surname of the Montferrands, owners of a very large part of the peninsula until the 18th century.