Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 381 | Otaktay | NativeAmerican | Kills many (Sioux). | M | |
| 382 | Othello | Shakespearean | 'The Tragedy of Othello, Moor of Venice' Othello, the Moor, general of the Venetian forces. | M | |
| 383 | Othin | Norse | God of the sky. | M | |
| 384 | Othman | German | Wealthy. | M | |
| 385 | Othmann | German | Wealthy. | M | |
| 386 | Othmar | Teutonic | Happy fame. | M | |
| 387 | Othni | Biblical | My time, my hour. | M | |
| 388 | Othniel | Biblical | The hour of God | M | |
| 389 | Otho | German | Wealthy. | M | |
| 390 | Othomann | German | Wealthy. | M | |
| 391 | Otik | Czechoslovakian | Wealthy. | M | |
| 392 | Otik | Teutonic | Rich. | M | |
| 393 | Otis | German | Wealthy. | M | |
| 394 | Otis | Greek | Keen of hearing. | M | |
| 395 | Oto | Teutonic | Rich. | M | |
| 396 | Otoahhastis | NativeAmerican | Tall bull (Cheyenne). | M | |
| 397 | Otoahnacto | NativeAmerican | Bull bear (Cheyenne). | M | |
| 398 | Otokars | Teutonic | Rich. | M | |
| 399 | Otomars | Teutonic | Rich. | M | |
| 400 | Otos | Greek | Keen of hearing. | M | |