Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 1 | Oadira | Muslim | Powerful. Potent.. | F | |
| 2 | Oaisara | Muslim | Empress. Wife of Caesar.. | F | |
| 3 | Oamra | Muslim | The moon.. | F | |
| 4 | Obelia | Greek | Pointed pillar. | F | |
| 5 | Obelie | Greek | Pointed pillar. | F | |
| 6 | Obharnait | Irish | The color of olive. | F | |
| 7 | Obil | Biblical | That weeps, who deserves to be bewailed. | F | |
| 8 | Oceana | Greek | Form of Oceanus. In Greek mythology Oceanus was a Titan father of rivers and water nymphs. | F | |
| 9 | Octavia | Italian | Born eighth. | F | |
| 10 | 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 | |
| 11 | Octavia | Shakespearean | Antony and Cleopatra'. Sister to Caesar and wife to Mark Antony. | F | |
| 12 | Octaviana | Latin | Eighth. Feminine of Octavius. A clan name of Roman Emperors. | F | |
| 13 | Octavie | Latin | Born eighth. | F | |
| 14 | Ocyale | Latin | An Amazon. | F | |
| 15 | Ocypete | Greek | A Harpy. | F | |
| 16 | Oda | German | Elfin spear. | F | |
| 17 | Oda | Norse | Point. | F | |
| 18 | Odahingum | NativeAmerican | Rippling water (Chippewa). | F | |
| 19 | Odanda | Spanish | Famous land. | F | |
| 20 | Odd | Norse | Point. | F | |