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Dictionary of Medieval Names
from European Sources

Helgi m. Old Norse helgi, from Old Norse *heiligr 'happy, lucky'.

Sweden
Middle Norwegian
1383 Hælgha (gen) SRA-vol2 no. 1915
Preview. DO NOT cite as: S.L. Uckelman. "Helgi". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 1. http://dmnes.org/2015/1/name/Helgi.