Dictionary of Medieval Names
from European Sources

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

England
Latin
1086 Harduinus (nom) Withycombe s.n. Hardwin; 1189 Herdwin (nom) GASurv p. 115, Herdwinus (nom) ibid. p. 115
France
Latin
1079x1101 Harduinus (nom) CartStPC IX; 1101x1129 Harduini (gen) ibid. XXVIII, Harduino (abl) ibid. XXVIII; 1178 Harduinus (nom) clairvaux-12thc 166
Germany
Latin
1137 Harduini (gen) quix-vol1 102; 1234 Hertwinus (nom) hennes-vol1 89; 1401 hertwini (gen) HD1401 no. 386
Italy
Latin
1156 Arduino (dat) CartYonne1 CCCLXXIX
Portugal
Latin
1179 Arduinus (nom) PHGCRP-I no. 4
Cite as: J. Uckelman, S.L. Uckelman. "Hartwin". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2016, no. 4. http://dmnes.org/2016/4/name/Hartwin.