Witbertm.Old Saxonwidu, wido, Old High Germanwitu 'wood' or Old High Germanwīt, Old Saxonwīd 'wide' + Old High Germanberaht, Old Saxonberht 'bright' from Proto-Germanic*berhtaz.
Cite as: A. Brown, S.L. Uckelman. "Witbert". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2021, no. 1. http://dmnes.org/2021/1/name/Witbert.