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Dictionary of Medieval Names
from European Sources

Alfsy m. Old English ælf 'elf' + Old English sige 'victory'.

England
Latin
967 Ælfsi (nom) CDAS DXXXVI, Ælfsige (abl) ibid. DXXXIII
Cite as: S.L. Uckelman. "Alfsy". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Alfsy.