Dictionary of Medieval Names
from European Sources

Roenhoiarn m. Old Breton roen, roin 'royal, of kingly lineage' + Old Breton (ho)iarn 'iron'.

France
Latin
833 Roenhoiarn (nom) CartRed V
Cite as: S.L. Uckelman. "Roenhoiarn". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Roenhoiarn.