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Dictionary of Medieval Names
from European Sources

Landwin m. Old High German lant, Old Saxon land 'land' + Old High German wini 'friend'.

The name was used in France throughout the 8th-11th C. The name was also used in Germany, but was never as popular.

France
Latin
700 Landwinus (nom) DCEL-2 XIV; c823 Landoinus (nom) irminon-vol2 19, Gaugiacum
Cite as: S.L. Uckelman. "Landwin". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 2. http://dmnes.org/2015/2/name/Landwin.