| Italian |
Etymology | English |
| Obdulia |
Ancient feminine name of Celtic origin; obstinant. | N/A |
| Obizio |
From the Latin "Obicius"; he who wants to be in the forefront. | N/A |
| Oceano |
Originally Greek, from the Latin "Oceanus", epiteth of the god of the sea; immensity. | N/A |
| Oddino |
From old German; proprietor of little wealth. | N/A |
| Oddone |
Derived from the Longobard "Odan", latinized as Oddo and Odonis; owner, proprietor. | N/A |
| Odetta |
From the ancient German "Odon"; proprietor. | N/A |
| Odilia |
Feminine name derived from Celtic; heir, inheritor. | N/A |
| Odilone |
From Celtic latinized as "Odilonis"; heir, inheritor. | N/A |
| Odo |
From the ancient German "Odon"; proprietor. | N/A |
| Odorico |
Derived from the ancient German "Od-Rik"; very rich, wealthy. | N/A |
| Ofelia |
Derived from the Greek "Ofeleia"; she who helps, assistant. | N/A |
| Oglerio |
Ancient name of Gallic origin; reader of the scriptures. | N/A |
| Olao |
From the Scandinavian "Olaf", derived from "Olafr"; son. | N/A |
| Olcese |
Name commonly used in the Liguria region, derived from "Ursicino"; little bear. | N/A |
| Olga |
Typically Russian name, derived from ancient the Scandinavian "Helgi"; saintly, holy. | N/A |
| Olimpia |
Derived from the Greek "Olympia"; lives on Mount Olympus. | N/A |
| Olimpiade |
From Greek, latinized as "Olympiades"; lives on Mount Olympus. | N/A |
| Olimpio |
Derived from Greek, latinized as "Olympius"; celestial. | N/A |
| Oliva |
Derived from the same Latin homonym; olive. | N/A |
| Olivia |
Derived from the Celtic "Oll" and "Wer"; very ardent, passionate. | N/A |
| Oliviera |
Feminine form of Oliviero with the same meaning. | N/A |
| Oliviero |
Derived from the Latin "Oliverius"; proprietor of olive groves.. | N/A |
| Ollegario |
From ancient Saxon, latinized as "Oligerus"; very diligent. | N/A |
| Ombelina |
Derived from Longobard; has a small shadow. | N/A |
| Omero |
Derived from the ancient French "Audomer", latinized as "Homerus"; known for his land holdings. | Homer |
| Omobono |
Derived from Latin; good man. | N/A |
| Onesiforo |
Derived from Greek, latinized as "Onesiphorus"; useful. | N/A |
| Onesimo |
Derived from Greek, latinized as "Onesimus"; useful, beneficial. | N/A |
| Onesta |
From the Latin "Honestas"; proven, time honored. | N/A |
| Onesto |
From the Latin "Honestus"; proven, gentleman. | N/A |
| Onofrio |
From the Latin "Omuphrius", derived from the Coptic "Uenofre"; he who is good.. | N/A |
| Onorata |
Feminine form of Onorato; esteemed, honored. | N/A |
| Onorato |
From the Latin "Honoratus"; esteemed. | N/A |
| Onorina |
Diminutive of Onorata with the same meaning. | N/A |
| Onorio |
From the Latin "Honor"; he who is respected. | N/A |
| Opilio |
From Greek, latinized as "Opilius"; shepherd. | N/A |
| Oranna |
Derived from Gaelic; praying. | N/A |
| Orazio |
Derived from the Greek "Orates", latinized as "Horatius"; seer, clairvoyant. | Horatio |
| Orenzio |
Derived from the Latin "Orentius"; praying. | N/A |
| Oreste |
Derived from the Greek "Orestees"; mountain man. | N/A |
| Orfeo |
From Hebrew, latinized as "Orpheus"; stubborn, hard headed. | Orpheus |
| Oricolo |
Derived from the Latin "Oriculus", name of ethnic origin; from Oricumu, present day Erico in Albania. | N/A |
| Origene |
Derived from the Greek "oros" and "ghenos"; from the mountain. | N/A |
| Oringa |
Feminine name of Iberian origin; inhabitant of Oringis, ancient Spanish locality chosen as a settlement by the Carthagians. | N/A |
| Orio |
From the Greek "Hoorios"; beautiful, elegant. | N/A |
| Orlando |
Frankish-Latin name, derived from "Hruodolandus"; gives glory to his country. | N/A |
| Ormisda |
From Persian, latinized as "Hormisdas"; good. | N/A |
| Ornella |
Relatively new name, derived from Ornello, name found in the author D'Annunzio's book "Jorio's daugher"; flexible, young. | N/A |
| Oronzo |
From the Latin "Orontius"; swift, agile. | N/A |
| Orre |
Derived from the Latin "Horreo"; hirsute, curly haired. | N/A |
| Orsino |
Diminutive of Latin name "Ursus"; small bear. | N/A |
| Orso |
Derived from the Latin name "Ursus"; bear. | N/A |
| Orsola |
Diminutive of the Latin name "Ursa" with the same meaning of "Orso"; bear. | N/A |
| Orsolina |
Diminutive of Latin name "Orsola"; small bear. | N/A |
| Ortensia |
Derived from the Latin "Hortensis", from "Hortense", pseudonym given to Venus; she who is in the garden. | N/A |
| Ortensio |
Derived from the Latin "Hortènsius"; takes care of the garden, gardener. | N/A |
| Ortolana |
Feminine form of Ortolano with the same meaning. | N/A |
| Ortolano |
Derived from the Latin "Hortolanus"; worke of the garden, gardener. | N/A |
| Osanna |
Very rare feminine name, derived from the Hebrew "Hosannah"; halleluiah. | N/A |
| Oscar |
From the archaic German "Oskar", latinized as "Anscarius"; warrior of God. | N/A |
| Osea |
Derived from the Hebrew "Hoseah"; saved by the Lord. | N/A |
| Osmondo |
Derived from the ancient High German "Osmund"; protected by God. | N/A |
| Ospizio |
Derived from the Latin "Hospitiume"; he who gives refuge. | N/A |
| Ostiano |
From the Latin "Hostianus"; sacrificed. | N/A |
| Osvaldo |
Derived from the ancient Saxon "Hos" and "Wald"; defender of the home. | Oswald |
| Otilia |
Variation of "Ottilia", derived from the Bavarian "Ottilie"; heir. | N/A |
| Otmaro |
Derived from ancient German; he who elates, makes happy. | N/A |
| Ottato |
Derived from Latin; he who has opted for, he who has selected Christianity. | N/A |
| Ottaviano |
Derived from the Latin "Octaviano"; son of Octavius. | Octavian |
| Ottavio |
Derived from the Latin "Octavius"; eighth son. | N/A |
| Ottilia |
Italian variation of the German name "Ottilie", like "Odilia"; heir. | N/A |
| Ottone |
Derived from the ancient Saxon "Athad", latinized as "Othonem"; proprietor, owner. | N/A |
| Ovidio |
From the Latin Ovidius; owner of cattle. | N/A |
