Dictionary of Medieval Names
from European Sources

Ermengilde f. Old High German ermen, Old Saxon irmin 'great, strong' + Proto-Germanic *geldą 'reward, gift, money'.

France
Latin
c823 Ermengildis (nom) irminon-vol2 39
Cite as: S.L. Uckelman. "Ermengilde". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Ermengilde.