Dictionary of Medieval Names
from European Sources

Haelcar m. Old Breton hael 'generous, noble' + Old Breton car 'friend, kinsman'.

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