Boy Baby Names - O
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| NAME | ORIGIN | MEANING |
| Ostein | Norse | Happy. |
| Osten | Norse | Happy. |
| Osvald | Teutonic | Divine power. |
| Osvif | Norse | Father of Gudrun. |
| Oswald | Old-English | divinely powerful |
| Oswaldo | Teutonic | Divine power. |
| Oswallt | Welsh | Welsh form of Oswald 'strength from God'. |
| Osweald | English | Divinely powerful. |
| Oswell | English | Divinely powerful. |
| Oswin | Old-English | God friend |
| Oswine | Anglo-Saxon | Name of a king. |
| Oswiu | Anglo-Saxon | Name of a king. |
| Oswy | Anglo-Saxon | Name of a king. |
| Oszkar | Hungarian | Hungarian form of Oscar 'leaping warrior'. |
| Ota | Teutonic | Rich. |
| Otaktay | Native American | Kills many (Sioux). |
| Othello | Greek | Prosperous |
| Othin | Norse | God of the sky. |
| Othman | German | Wealthy. |
| Othmann | German | Wealthy. |
| Othmar | Teutonic | Happy fame. |
| Othni | Biblical | My time, my hour. |
| Othniel | Biblical | The hour of God |
| Otho | German | Wealthy. |
| Othomann | German | Wealthy. |
| Otieno | African | Born at Night |
| Otik | Czechoslovakian | Wealthy. |
| Otis | Greek, Old German | acute; wealthy |
| Oto | Teutonic | Rich. |
| Otoahhastis | Native American | Tall bull (Cheyenne). |
