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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 2016, no. 3. http://dmnes.org/2016/3/name/Bertegar.