| # | Name | Origin | Meaning | Gender | Save |
|---|---|---|---|---|---|
| 1521 | 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 | |
| 1522 | Octaviana | Latin | Eighth. Feminine of Octavius. A clan name of Roman Emperors. | F | |
| 1523 | Octavie | Latin | Born eighth. | F | |
| 1524 | Ocyale | Latin | An Amazon. | F | |
| 1525 | Odessa | Latin | Wandering; quest. Variant of Odysseus. | F | |
| 1526 | Oenone | Latin | Daughter of Cebren. | F | |
| 1527 | OIethe | Latin | Honest. | F | |
| 1528 | Olethea | Latin | Honest. | F | |
| 1529 | Olethia | Latin | Honest. | F | |
| 1530 | Olinda | Latin | Fragrant. | F | |
| 1531 | Olithia | Latin | Honest. | F | |
| 1532 | Oliva | Latin | Variant of Olive: Olive: symbol of peace. | F | |
| 1533 | Olive | Latin | Symbol of peace. | F | |
| 1534 | Olivia | Latin | Variant of Olive: Olive: symbol of peace. | F | |
| 1535 | Olivie | Latin | Olive. | F | |
| 1536 | Ollie | Latin | Diminutive of Olive: Olive: symbol of peace. | F | |
| 1537 | Oma | Latin | Named for Bona Dea. | F | |
| 1538 | Omora | Latin | Honor. | F | |
| 1539 | Omoria | Latin | Honor. | F | |
| 1540 | Ona | Latin | Only child; also can be a variant of Una: One. | F | |