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Dictionary of Medieval Names
from European Sources

Hartwin m. Old Saxon hard, Old High German hart 'strong, hard' + Old High German wini 'friend'.

Germany
Latin
1234 Hertwinus (nom) hennes-vol1 89; 1401 hertwini (gen) HD1401 no. 386
Cite as: S.L. Uckelman. "Hartwin". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2015, no. 3. http://dmnes.org/2015/3/name/Hartwin.