Artcarm.Old Bretonarth 'bear' + Old Bretoncar 'friend, kinsman'.
Some forms of the name can also be forms of Hartger.
Cite as: S.L. Uckelman. "Artcar". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2021, no. 1. http://dmnes.org/2021/1/name/Artcar.