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Dictionary of Medieval Names
from European Sources

Erma f. A pet form of any of various names beginning with Old High German ermen, Old Saxon irmin 'strong', such as Ermenburg, Ermentrude, or Ermengard, or the same element used as a standalone name.

France
Latin
c1140 Erma (nom) CartNDdOurscamp LXXXIII
657 Hermena (nom) DCEL-2 CCCXXVIII; 1101x1129 Ermeline (dat) CartStPC XXIII
Cite as: J. Uckelman, S.L. Uckelman. "Erma". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Erma.