Dictionary of Medieval Names
from European Sources

Cadhoiarn m. Old Breton, Old Welsh cat 'battle' + Old Breton (ho)iarn 'iron'.

France
Latin
833 Cathoiarn (nom) CartRed VIII; 833x834 Cathoiarn (nom) ibid. IX
Cite as: S.L. Uckelman. "Cadhoiarn". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Cadhoiarn.