| Name | Origin | Meaning | Gender | Save |
| O' | Irish | Descendent of. Irish surnames formed by prefacing O'. | M | ![]() |
| O'brian | Irish | Surname. | M | ![]() |
| O'brien | Irish | Surname. | M | ![]() |
| O'keefe | Irish | Surname. | M | ![]() |
| O'shay | Irish | Surname. | M | ![]() |
| O'shea | Irish | Surname. | M | ![]() |
| Oadira | Muslim | Powerful. Potent.. | F | ![]() |
| Oaisara | Muslim | Empress. Wife of Caesar.. | F | ![]() |
| Oakden | English | From the oak tree valley. | M | ![]() |
| Oakes | English | From the oak. | M | ![]() |
| Oakley | English | From the oak - tree meadow. | M | ![]() |
| Oamra | Muslim | The moon.. | F | ![]() |
| Oates | German | Variant of Odo: Wealth. | M | ![]() |
| Oba | Egyptian | King. | M | ![]() |
| Obadiah | Biblical | Servant of the Lord | M | ![]() |
| Obadiah | Hebrew | Servant/worshipper of the Lord. Obadiah was the prophet who wrote the shortest book in the Old Testament. | M | ![]() |
| Obal | Biblical | Inconvenience of old age. | M | ![]() |
| Obed | Biblical | A servant; workman | M | ![]() |
| Obed-edom | Biblical | Servant of Edom | M | ![]() |
| Obediah | Hebrew | Serves God. | M | ![]() |
| Obelia | Greek | Pointed pillar. | F | ![]() |
| Obelie | Greek | Pointed pillar. | F | ![]() |
| Oberon | English | In A Midsummer Night's Dream, Shakespeare altered the spelling to Auberon, king of the fairies, to Oberon. | M | ![]() |
| Oberon | German | Noble and bear-like. In a Midsummer Night's Dream, Shakespeare altered the spelling of Auberon (King of the fairies) to Oberon. | M | ![]() |
| Oberon | Shakespearean | A Midsummer Night's Dream' King of the Fairies. | M | ![]() |
| Obharnait | Irish | The color of olive. | F | ![]() |
| Obiareus | Greek | A Titan. | M | ![]() |
| Obil | Biblical | That weeps, who deserves to be bewailed. | F | ![]() |
| Obil | Biblical | That weeps, who deserves to be bewailed. | M | ![]() |
| Oboth | Biblical | 'Dragons, fathers, desires' | M | ![]() |
| Oceana | Greek | Form of Oceanus. In Greek mythology Oceanus was a Titan father of rivers and water nymphs. | F | ![]() |
| Oceanus | Greek | Father of the Oceanids. | M | ![]() |
| Ocelfa | English | From the high plain. | M | ![]() |
| Ocnus | Greek | Incompetent. | M | ![]() |
| Ocran | Biblical | A disturber, that disorders. | M | ![]() |
| Octave | French | Born eighth. | M | ![]() |
| Octavia | Italian | Born eighth. | F | ![]() |
| Octavia | Latin | Born Eighth. In the Roman Empire, Octavia was the sister of Octavian who was married to Mark Antony (as a political alliance). They were later divorced (in 32 BC). | F | ![]() |
| Octavia | Shakespearean | Antony and Cleopatra'. Sister to Caesar and wife to Mark Antony. | F | ![]() |
| Octavian | Latin | Variant of Octavius: Born eighth. Octavian was the name used commonly for the Emperor Augustus. | M | ![]() |
| Octaviana | Latin | Eighth. Feminine of Octavius. A clan name of Roman Emperors. | F | ![]() |
| Octavie | Latin | Born eighth. | F | ![]() |
| Octavio | Latin | Eighth. | M | ![]() |
| Octavius | Latin | Born eighth. Octavius was a Roman clan name, as well as the original name of Emperor Augustus (commonly known as Octavian). Traditionally, this name was given to the eighth child in a large family. | M | ![]() |
| Octavius | Shakespearean | Antony and Cleopatra'. Octavius Caesar, Roman triumvir. 'The Tragedy of Julius Caesar' Triumvir after Caesar's death, later Augustus Caesar, first emperor of Rome. | M | ![]() |
| Octe | Anglo-Saxon | A son of Hengist. | M | ![]() |
| Octha | Anglo-Saxon | A son of Hengist. | M | ![]() |
| Octha | ArthurianLegend | Enemy of Arthur. | M | ![]() |
| Ocumwhowurst | NativeAmerican | Yellow wolf (Cheyenne). | M | ![]() |
| Ocunnowhurst | NativeAmerican | Yellow wolf (Cheyenne). | M | ![]() |
| Ocvran | ArthurianLegend | Father of Guinevere. | M | ![]() |
| Ocyale | Latin | An Amazon. | F | ![]() |
| Ocypete | Greek | A Harpy. | F | ![]() |
| Oda | German | Elfin spear. | F | ![]() |
| Oda | Norse | Point. | F | ![]() |
| Odahingum | NativeAmerican | Rippling water (Chippewa). | F | ![]() |
| Odakota | NativeAmerican | Friend (Sioux). | M | ![]() |
| Odale | English | Of the valley. | M | ![]() |
| Odam | English | Son in law. | M | ![]() |
| Odanda | Spanish | Famous land. | F | ![]() |
| Odanodan | Irish | Of the red earth. | M | ![]() |
| Odayle | English | Of the valley. | M | ![]() |
| Odbart | German | Wealthy. | M | ![]() |
| Odd | Norse | Point. | F | ![]() |
| Odd | Norse | Point. | M | ![]() |
| Oddfrid | Norse | Beautiful point. | F | ![]() |
| Oddie | German | Variant of Odo: Wealth. | M | ![]() |
| Oddleif | Norse | Point descendant. | M | ![]() |
| Oddnaug | Norse | Pointed. | F | ![]() |
| Oddny | Norse | New point. | F | ![]() |
| Oddvar | Norse | Pointable. | M | ![]() |
| Oddveig | Norse | Pointed. | F | ![]() |
| Ode | Egyptian | From the road. | F | ![]() |
| Ode | Teutonic | Rich. | M | ![]() |
| Oded | Biblical | To sustain, hold or lift up. | M | ![]() |
| Oded | Hebrew | Encourages. | M | ![]() |
| Odeda | Hebrew | Strong. | F | ![]() |
| Odede | Hebrew | Strong. | F | ![]() |
| Odel | Anglo-Saxon | Wealthy. | M | ![]() |
| Odele | Greek | Harmonious. | F | ![]() |
| Odelet | Greek | Little singer. | F | ![]() |
| Odeletta | French | Little spring. | F | ![]() |
| Odelette | French | Little spring. | F | ![]() |
| Odelette | Greek | Little singer. | F | ![]() |
| Odelia | Anglo-Saxon | Little wealthy one. | F | ![]() |
| Odelia | Teutonic | Wealthy. | F | ![]() |
| Odelina | Anglo-Saxon | Little wealthy one. | F | ![]() |
| Odelina | German | Elfin spear. | F | ![]() |
| Odelinda | Anglo-Saxon | Little wealthy one. | F | ![]() |
| Odell | Anglo-Saxon | Wealthy. | M | ![]() |
| Odell | English | Of the valley. | M | ![]() |
| Odell | Irish | Surname. | M | ![]() |
| Odell | Norse | Wealthy. | M | ![]() |
| Odella | Anglo-Saxon | Little wealthy one. | F | ![]() |
| Odelle | Greek | Harmonious. | F | ![]() |
| Odelyn | Anglo-Saxon | Little wealthy one. | F | ![]() |
| Odelyna | Anglo-Saxon | Little wealthy one. | F | ![]() |
| Odessa | Greek | Wrathful. | F | ![]() |
| Odessa | Latin | Wandering; quest. Variant of Odysseus. | F | ![]() |
| Odette | Anglo-Saxon | Little wealthy one. | F | ![]() |