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Dictionary of Medieval Names
from European Sources

Ermesinde f. Old High German ermen, Old Saxon irmin 'great, strong' + Old Saxon swīth, Gothic swinþs from Proto-Germanic *swinþaz 'strong'.

France
Latin
1038 Ermensenna (nom) StVdM-II 719; a1127 Ermesindis (nom) ibid. 701
Cite as: S.L. Uckelman. "Ermesinde". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Ermesinde.