Wernbert m. Germanic war(in) 'guard' + Old High German beraht, Old Saxon berht 'bright' from Proto-Germanic *berhtaz.

France

Latin

● c823 Warimbertus (nom) irminon-vol2 31, Palatiolum; 1135 Garembertus (nom) clairvaux-12thc 7; 1138x1162 Waremberti (gen) ibid. 85, Waremberto (abl) ibid. 60, Warembertus (nom) ibid. 80, Weremberti (gen) ibid. 76; 1147 Garembertus (nom) ibid. 17; 1163–64 Warembertus (nom) ibid. 107; 1164 Warembertus (nom) ibid. 120

Germany

Latin

● 822x75 Wirinbertus (nom) TradCorb §182; 1135 Werebertus (nom) quix-vol1 64; 1173 Werenberto (abl) ibid. 99, Werenbertus (nom) ibid. 81; 1185 Werembertus (nom) ibid. 37; 1189 Werenbertus (nom) ibid. 82; 1191 Werembertus (nom) ibid. 38; 1192 Werebertus (nom) ibid. 66, Werembertus (nom) ibid. 40