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Dictionary of Medieval Names
from European Sources

Dagbert m. Old Saxon, Old Dutch dag, Old High German tag 'day' + Old High German beraht, Old Saxon berht 'bright' from Proto-Germanic *berhtaz..

The name of a number of 7th C Frankish kings.

Germany
Latin
1137 Dagoberti (gen) quix-vol1 102
Preview. DO NOT cite as: S.L. Uckelman. "Dagbert". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 1. http://dmnes.org/2015/1/name/Dagbert.