Dictionary of Medieval Names
from European Sources

Beauoncle m. Old French biau, bel, Middle French beau 'beautiful, fair; handsome, comely' + Old French, Middle French oncle 'uncle'.

France
Old French
1313 Biaus-Oncles Paris1313 p. 14
Cite as: S.L. Uckelman. "Beauoncle". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Beauoncle.