Boy Baby Names - O
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| NAME | ORIGIN | MEANING |
| Otoahnacto | Native American | Bull bear (Cheyenne). |
| Otokars | Teutonic | Rich. |
| Otomars | Teutonic | Rich. |
| Otos | Greek | Keen of hearing. |
| Ottah | Egyptian | Third born. |
| Ottar | Norse | Fighter. |
| Ottavio | Latin | Born eighth. |
| Otto | German | Wealthy |
| Ottokar | German | Happy fighter. |
| Ottoway | Teutonic | Lucky in war. |
| Otus | Greek | Keen of hearing. |
| Otway | Teutonic | Lucky in war. |
| Oubastet | Egyptian | A cat. |
| Ouray | Native American | Arrow. |
| Ourson | French | Little bear. |
| Outram | Teutonic | Wealthy raven. |
| Ovadiah | Hebrew | Serves God. |
| Ovadya | Hebrew | Serves God. |
| Ovaegir | Norse | Father of the Skraeling children. |
| Oved | Hebrew | Worker. |
| Ovid | Latin | lamb |
| Ovidio | Spanish | Shepherd |
| Owain | Arthurian Legend | Son of Urien. |
| Owein | Welsh | Young warrior. |
| Owen | Old Welsh, Greek | warrior; well born |
| Owin | Celtic | Young fighter. |
| Owyn | Celtic | Young fighter. |
| Owynn | Welsh | Wellborn. Form of Ewan. |
| Oxa | Anglo-Saxon | Ox. |
| Oxford | Old-English | from where the oxen ford |
