Hersent f. Old High German heri 'host, army' + Old Saxon swīth, Gothic swinþs from Proto-Germanic *swinþaz 'strong'.

France

Latin

● 1079x1081 Arsendi (abl) CartNDSaintes XXI; 1095 Arsendi (dat) ibid. V, Arsendis (nom) ibid. V; 1101x1129 Hersendis (nom) CartStPC XXXII; 1127 Hersendis (gen) ibid. XIX; 1131 Arsendi (abl) CartNDSaintes XXII; 1135 Ersenna (abl) clairvaux-12thc 7; 1138x1162 Hersende (abl) ibid. 56, Hersenz (abl) ibid. 90, Hersinde (abl) ibid. 62; 1147 Ersen (abl) ibid. 18, Ersendis (nom) ibid. 19, Hersende (abl) ibid. 14, Hersendi (abl) ibid. 15, Hersendis (nom) ibid. 15, Hersennis (nom) ibid. 15; a1163 Hersendis (nom) ibid. 96; 1164 Hersendis (nom) ibid. 120, Hersenz (nom) ibid. 120; 1179 Ersendi (abl) ibid. 181, Hersendi (abl) ibid. 177, Hersendis (nom) ibid. 177

Old French

● 1296 Hersent paris1296 p. 61