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Dictionary of Medieval Names
from European Sources

Grimwin m. Old High German, Old Saxon grim 'grim, fierce, bold' + Old High German wini 'friend'.

France
Latin
c823 Grimoinus (nom) irminon-vol2 a, Palatiolum
Cite as: S.L. Uckelman. "Grimwin". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 3. http://dmnes.org/2016/3/name/Grimwin.