| # | Nombre | Orígen | Significado | Género | |
|---|---|---|---|---|---|
| 1 | Oadira | Musulman | Powerful. Potent.. | F | |
| 2 | Oaisara | Musulman | Empress. Wife of Caesar.. | F | |
| 3 | Oamra | Musulman | The moon.. | F | |
| 4 | Obelia | Griego | Pointed pillar. | F | |
| 5 | Obelie | Griego | Pointed pillar. | F | |
| 6 | Obharnait | Irlandes | The color of olive. | F | |
| 7 | Obil | Biblico | That weeps, who deserves to be bewailed. | F | |
| 8 | Oceana | Griego | Form of Oceanus. In Griego mythology Oceanus was a Titan Padre of rivers and water nymphs. | F | |
| 9 | Octavia | Italiano | Born eighth. | F | |
| 10 | Octavia | Latino | 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 | Shakesperiano | Antony and Cleopatra'. Sister to Caesar and wife to Mark Antony. | F | |
| 12 | Octaviana | Latino | Eighth. Feminine of Octavius. A clan name of Roman Emperors. | F | |
| 13 | Octavie | Latino | Born eighth. | F | |
| 14 | Ocyale | Latino | An Amazon. | F | |
| 15 | Ocypete | Griego | A Harpy. | F | |
| 16 | Oda | Aleman | Elfin spear. | F | |
| 17 | Oda | Nordico | Point. | F | |
| 18 | Odahingum | Nativo Americano | Rippling water (Chippewa). | F | |
| 19 | Odanda | Espanol | Famous land. | F | |
| 20 | Odd | Nordico | Point. | F | |