St. Armand was refered to as the patron saint in many places, Longpre was just one of those places. In that context he would be referred to as St. Armand de Longpre.It was not part of his name.
Born 584 Lower Poitou
Died 675 Saint-Amand
Honored in Roman Catholic Church, Eastern Orthodox Church
Feast February 6 (formerly February 1) Attributes chair, church, flag Patronage of: Wine makers, Beer brewers, merchants, innkeepers, bartenders, Boy Scouts
Saint Amand or Amandus (Amantius) (birth-name Jacob) (c. 584 – 675) was a French Christian saint, one of the great Christian Saints of Flanders.
Saint-Amand, may refer to the following places: in Belgium • Saint-Amand (Fleurus), a village in the commune of Fleurus, Hainaut • Sint-Amands, a municipality in the province of Antwerp
in France • Saint-Amand, Creuse, in the Creuse département • Saint-Amand, Manche, in the Manche département • Saint-Amand, Pas-de-Calais, in the Pas-de-Calais département • Saint-Amand-de-Belvès, in the Dordogne département • Saint-Amand-de-Coly, in the Dordogne département • Saint-Amand-des-Hautes-Terres, in the Eure département • Saint-Amand-de-Vergt, in the Dordogne département • Saint-Amand-en-Puisaye, in the Nièvre département • Saint-Amand-Jartoudeix, in the Creuse département • Saint-Amand-le-Petit, in the Haute-Vienne département • Saint-Amand-les-Eaux, in the Nord département • Saint-Amand-Longpré, in the Loir-et-Cher département • Saint-Amand-Magnazeix, in the Haute-Vienne département • Saint-Amand-Montrond, in the Cher département • Saint-Amand-sur-Fion, in the Marne département • Saint-Amand-sur-Ornain, in the Meuse département • Saint-Amand-sur-Sèvre, in the Deux-Sèvres département
You are looking for a connection not me.I prefer not to skip over 30+ generations just to say that I am connected to royalty.