Starting with letter O
| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 401 | Ottah | Egyptian | Third born. | M | |
| 402 | Ottar | Norse | Fighter. | M | |
| 403 | Ottavio | Latin | Born eighth. | M | |
| 404 | Otto | German | Born eighth or wealthy. | M | |
| 405 | Otto | Swedish | Wealthy. | M | |
| 406 | Otto | Teutonic | Wealthy. | M | |
| 407 | Ottokar | German | Happy fighter. | M | |
| 408 | Ottoway | Teutonic | Lucky in war. | M | |
| 409 | Otus | Greek | Keen of hearing. | M | |
| 410 | Otway | Teutonic | Lucky in war. | M | |
| 411 | Oubastet | Egyptian | A cat. | M | |
| 412 | Ouray | NativeAmerican | Arrow. | M | |
| 413 | Ourson | French | Little bear. | M | |
| 414 | Outram | Teutonic | Wealthy raven. | M | |
| 415 | Ovadiah | Hebrew | Serves God. | M | |
| 416 | Ovadya | Hebrew | Serves God. | M | |
| 417 | Ovaegir | Norse | Father of the Skraeling children. | M | |
| 418 | Ove | Norse | Ancestors. | M | |
| 419 | Ove | Swedish | Egg. | M | |
| 420 | Oved | Hebrew | Worker. | M | |