Dictionary of Medieval Names
from European Sources

Betta f. A hypocoristic of any of various names containing Old High German beraht, Old Saxon berht 'bright' from Proto-Germanic *berhtaz, or of Bertha.

France
Latin
c823 Betta (nom) irminon-vol2 a, Palatiolum
Cite as: S.L. Uckelman. "Betta". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Betta.