Dictionary of Medieval Names
from European Sources

Blathilde f. Old French blad, of uncertain origin, either (1) a metathesis of Old High German bald 'bold' or (2) Old Saxon blad, Old High German blat 'blade; leaf' + Old High German hiltja 'battle'.

France
Latin
c823 Blathildis (nom) irminon-vol2 68
Cite as: S.L. Uckelman. "Blathilde". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Blathilde.