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Dictionary of Medieval Names
from European Sources
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Helmdag m. Old High German, Old Saxon helm 'helmet' + Old Saxon, Old Dutch dag, Old High German tag 'day'.

Germany
Latin
● 822x875 Helmdag (nom) TradCorb §70
Cite as: S.L. Uckelman. "Helmdag". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Helmdag.