Dictionary of Medieval Names
from European Sources

Bertegar m. Old High German beraht, Old Saxon berht 'bright' from Proto-Germanic *berhtaz + Old High German, Old Saxon gēr 'spear'.

France
Latin
700 Bertegario (abl) DCEL-2 XIV; c823 Bertegarius (nom) irminon-vol2 76, Palatiolum, Bertgarius (nom) ibid. 102, Palatiolum
Cite as: S.L. Uckelman. "Bertegar". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Bertegar.