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Dictionary of Medieval Names
from European Sources

Dagmar m. Old Saxon, Old Dutch dag, Old High German tag 'day' + Old High German, Old Saxon māri from Proto-Germanic *mērijaz 'famous'.

Germany
Latin
1200 Dagmari (gen) hennes-vol1 5
Preview. DO NOT cite as: S.L. Uckelman. "Dagmar". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 1. http://dmnes.org/2015/1/name/Dagmar.