Dictionary of Medieval Names
from European Sources

Adrehar m. Old Saxon adro, Old High German adar 'fast' + Old High German heri 'host, army'.

France
Latin
c823 Adreharius (nom) irminon-vol2 44-45
Cite as: S.L. Uckelman. "Adrehar". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Adrehar.