Beg ar Vihl in Breton language I guess ;-). Don't expect any logic from Breton places into French, Kroaz Hent (crossroad) sometime became Croissant... Fully unrelated to the toponym, just to the sounding. You could have noticed the way it's written as cape in French. As they kept Ar Vihl in French, Pointe d'Ar Vihl _would_ be more logic.
But look at the oyster producer: https://www.abers-tourisme.com/commerce/viviers-de-beg-ar-vill/