Dictionary of Medieval Names
from European Sources

Bertwald m. Old High German beraht, Old Saxon berht 'bright' from Proto-Germanic *berhtaz + Old Saxon wald, Old High German walt 'power, authority'.

England
Latin
994 Beorhtwalt (nom) CDAS DCLXXXVI
France
Latin
657 Bertoaldo (abl) CartYonne1 VI; 658 Bertoaldus (nom) DCEL-2 CCCXXXIII; 814 Bertaldus (nom) StVdM-II F26; 1259 Bertaudus (nom) ArrestReg-volI III, Pentecost; 1300 Bertaudi (gen) CartNDdOurscamp LXIX
Old French
1292 Bertaut 1292paris p. 1; 1296 Berthaut paris1296 p. 18; 1313 Bertaut Paris1313 p. 3; 1327 Bertaut MemDocMan-2 p. 188
Middle French
1392 Bertaud MemBret-II col. 605; 1418 Bertault HGParis p. 379
Cite as: S.L. Uckelman. "Bertwald". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Bertwald.