Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 421 | Ovid | Hebrew | Worker. | M | |
| 422 | Ovid | Latin | Name of a poet. | M | |
| 423 | Owain | ArthurianLegend | Son of Urien. | M | |
| 424 | Owain | English | Variant of Ewen: Variant of Eoghan or Eugene. | M | |
| 425 | Owain | Greek | Variant of Eugene: Well-born. Famous bearer: Prince Eugene of Savoy; American playwright Eugene O'Neill. | M | |
| 426 | Owain | Welsh | Young warrior. | M | |
| 427 | Owein | Welsh | Young warrior. | M | |
| 428 | Owen | Celtic | Young fighter. | M | |
| 429 | Owen | English | Variant of Ewen: Variant of Eoghan or Eugene. | M | |
| 430 | Owen | Greek | Variant of Eugene: Well-born. Famous bearer: Prince Eugene of Savoy. | M | |
| 431 | Owen | Welsh | Young warrior. Also can be a variant of Eugene: Well-born. | M | |
| 432 | Owin | Celtic | Young fighter. | M | |
| 433 | Owin | Welsh | Young warrior. | M | |
| 434 | Owyn | Celtic | Young fighter. | M | |
| 435 | Owyn | Welsh | Young warrior. | M | |
| 436 | Owynn | Welsh | Wellborn. Form of Ewan. | M | |
| 437 | Oxa | Anglo-Saxon | Ox. | M | |
| 438 | Oxford | English | From the ox ford. | M | |
| 439 | Oxford | Shakespearean | 'King Henry the Sixth, Part III' Earl of Oxford. 'King Richard III' Earl of Oxford. | M | |
| 440 | Oxley | English | From the ox enclosure. | M | |