Dictionary of Medieval Names
from European Sources

Aldemar m. Old High German alt, Old Saxon, Old Frisian ald 'old' + Old High German, Old Saxon māri from Proto-Germanic *mērijaz 'famous'.

France
Latin
1060 Aldemarus (nom) StVdM-II 730
Cite as: S.L. Uckelman. "Aldemar". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Aldemar.