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Dictionary of Medieval Names
from European Sources

Gisland m. Proto-Germanic *gaisa, *gaiza 'arrow' + Old High German lant, Old Saxon land 'land'.

Italy
Latin
1300 Gislandi (gen) ActDipVeneto-I-1 p. 47, Gislando (dat) ibid. p. 47
Cite as: S.L. Uckelman. "Gisland". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 1. http://dmnes.org/2016/1/name/Gisland.