contemporaine, III (1956). Marec, Jacques. "Le banquier Jacques Laffitte, 1767–1844," Bulletin de la Société des amis du château de Maisons, No.3 (2008). Mathiez...
The element kjarr / ker is also found in Normandy in Villequier and Orcher. According to Françoisde Beaurepaire, it comes rather from the Old English chiriche...