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Dictionary of Medieval Names
from European Sources

Giambono m. A contractions of Giovanni, an Italian form of John, + Italian bono from Latin bonus 'good'.

Italy
Latin
1265x1339 Zamboni (gen) BBC-Berg 88, Zanboni (gen) ibid. 251; 1281 Zambonus (nom) ibid. p. XLIII; 1289 Çamboni (gen) ibid. p. XLIV
1198 Zambonino (abl) ChStBo1 III
Cite as: S.L. Uckelman. "Giambono". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2018, no. 1. http://dmnes.org/2018/1/name/Giambono.