word duron, Latinised as durum, was probably used to translate the Latin word forum (Compare Fréjus Forum Julii, dedicated to Julius (Caesar)).

In the Late Empire it took the name of the Celtic tribe who lived here: the Bodiocassi, Latinized in Bajocassi, Bajocasses, and this word explains the place-names Bayeux and Bessin. Bodiocassi has been compared with Old Irish Buidechass 'with blond