Dictionary of Medieval Names
from European Sources

Bonfilius m. Latin bonus 'good' + Latin filius 'son'.

The name of a 12th C Italian saint.

France
Latin
1075 Bonifilius (nom) StVdM-II 731; 1115 Bonifilii (gen) ibid. 734
French
1368 Bon Fillot beauchet-vol1 p. 13
Spain
Latin
1006 Bonefilius (nom) CDCB-XV MMCLXVI; 1014 Bonefilio (abl) ibid. MMCLXXII; 1019 Bonefilius (nom) ibid. MMCLXXIV, Bonifilio (nom) ibid. MMCLXXIV; 1020 Benefilio (nom) ibid. MMCLXXV, Bonefilio (nom) ibid. MMCLXXV; 1022 Bonefilio (abl) ibid. MMCLXXVI; 1192 Bonifilio (abl) ibid. MMCCVIII
Switzerland
Latin
1134 Bonus-filius (nom) CartHaut 1; 1141 Bono filio (abl) ibid. 3, Bonus filius (nom) ibid. 3; 1154 Bonifilii (gen) ibid. 5, Bonus filius (nom) ibid. 5; 1155 Boni filii (gen) ibid. 6, Bono filio (abl) ibid. 6; 1180 Bonus filius (nom) ibid. 26
Cite as: S.L. Uckelman. "Bonfilius". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2017, no. 1. http://dmnes.org/2017/1/name/Bonfilius.