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 2017, no. 1. http://dmnes.org/2017/1/name/Erma.