Dictionary of Medieval Names
from European Sources

Deurhoiarn m. Old Breton deur 'brave, courageous' + Old Breton (ho)iarn 'iron'.

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