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.
- ● 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 2017, no. 1. http://dmnes.org/2017/1/name/Landwin.