The story
* As an Irish surname, Anglicised from Irish Ó Baoithghill, possibly a compound of baoth (“vain, foolish”) and geall (“pledge”). * As a Scottish surname of Norman origin, from Biéville in Normandy, which could be from the Germanic personal name Boia + the common placename suffix -ville.
Etymology from Wiktionary, CC BY-SA 4.0.