Dictionary of Medieval Names
from European Sources

Bertwin m. Old High German beraht, Old Saxon berht 'bright' from Proto-Germanic *berhtaz + Old High German wini 'friend'.

Cf. Winebert.

France
Latin
c823 Bertoinus (nom) irminon-vol2 21, Gaugiacum
The Netherlands
Latin
855 Berahtwini (nom) OrkGZ no. 45
Cite as: S.L. Uckelman. "Bertwin". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2020, no. 1. http://dmnes.org/2020/1/name/Bertwin.