Erwan Vallerie ː Castellum Brienti, XIvet; Castro Brientii, 1265; Chateaubrient, 1265, 1348; Chasteaubrient, 1353; Castrum Briencii, 1453; Chasteaubriand, 1576; Chasteaubriant, 1624; Chateaubriand, 1779;