Dictionary of Medieval Names
from European Sources

Madwen f. Old Breton, Middle Welsh mat 'good, fortunate' + Welsh gwen 'fair, white; blessed'.

England
Early Modern English
1554 Madwen BarnstapleBap p. 8
Cite as: S.L. Uckelman. "Madwen". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Madwen.