Boy Baby Names - O
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| NAME | ORIGIN | MEANING |
| Oakden | English | From the oak tree valley. |
| Oakes | English | from the oak-tree grove |
| Oakley | Old-English | from the oak meadow |
| Oates | German | Variant of Odo: Wealth. |
| Oba | Egyptian | King. |
| Obadiah | Hebrew | servant of God |
| Obal | Biblical | Inconvenience of old age. |
| Obed | Biblical | A servant; workman |
| Obed-edom | Biblical | Servant of Edom |
| Obediah | Hebrew | Serves God. |
| Obelix | Greek | pillar of strength |
| Oberon | English | In A Midsummer Night's Dream, Shakespeare altered the spelling to Auberon, king of the fairies, to Oberon. |
| Obiajulu | African | the heart is consoled |
| Obiareus | Greek | A Titan. |
| Oboth | Biblical | 'Dragons, fathers, desires' |
| Oceanus | Greek | Father of the Oceanids. |
| Ocelfa | English | From the high plain. |
| Ochen | Ugandan | one of the twins |
| Ocnus | Greek | Incompetent. |
| Ocran | Biblical | A disturber, that disorders. |
| Octave | French | Born eighth. |
| Octavian | Latin | Variant of Octavius: Born eighth. Octavian was the name used commonly for the Emperor Augustus. |
| Octavio | Latin | The Eighth |
| Octavious | Latin | Eighth |
| Octavius | Latin | eighth child |
| Octe | Anglo-Saxon | A son of Hengist. |
| Octha | Anglo-Saxon | A son of Hengist. |
| Ocumwhowurst | Native American | Yellow wolf (Cheyenne). |
| Ocunnowhurst | Native American | Yellow wolf (Cheyenne). |
| Ocvran | Arthurian Legend | Father of Guinevere. |
