Dictionary of Medieval Names
from European Sources

Maenwallon m. Old Breton maen from Latin magnus 'large, great, strong' + Old Breton uuallon, Old Welsh uualaun, uualon 'valorous'.

France
Latin
834 Maenuuallon (nom) CartRed III
Cite as: S.L. Uckelman. "Maenwallon". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Maenwallon.