Gautbert m. Gaut 'Geat, Goth' + Old High German beraht, Old Saxon berht 'bright' from Proto-Germanic *berhtaz.

France

Latin

● 1029x1033 Gausbertus (nom) CartStPC XII; 1101x1129 Gosbertus (nom) ibid. XXXII; 1107 Gausbertus (nom) ibid. XVII; 1115x1149 Goisbertus (nom) ibid. X, Gosbertus (nom) ibid. X; 1130x1150 Gosbertus (nom) ibid. XXVII; 1135 Josberti (gen) clairvaux-12thc 7, Josbertum (acc) ibid. 7, Josbertus (nom) ibid. 7; 1138x1148 Josbertus (nom) ibid. 21; 1138x1162 Joberto (abl) ibid. 56, Josberto (abl) ibid. 56, Josbertus (nom) ibid. 64; 1143x1146 Gosberti (gen) ibid. 12, Gosberto (dat) ibid. 12, Gosbertus (nom) ibid. 12; 1145 Jobertus (nom) ibid. 11, Josbertus (nom) ibid. 11; 1147 Josberti (gen) ibid. 14, Josbertus (nom) ibid. 14; 1147x1162 Josberto (abl) ibid. 55, Josbertus (nom) ibid. 42; 1150 Josbertus (nom) ibid. 22; 1163 Josberti (gen) ibid. 99; 1163–64 Josberti (gen) ibid. 106, Josbertus (nom) ibid. 106; 1164 Joberti (gen) ibid. 120, Jobertus (nom) ibid. 120, Josberti (gen) ibid. 120, Josbertus (nom) ibid. 120; 1273 Gausberti (gen) RegToul-13thC p. 39, Gausbertus (nom) ibid. p. 35

Germany

Latin

● 847 Gosbrecht (abl) HambUrk-vol1 XII