Search boys Baby Names starting with letter O
| # | Name | Origin | Meaning | Gender | Save |
| 1 | O' | Irish | Descendent of. Irish surnames formed by prefacing O'. | M |  |
| 2 | O'brian | Irish | Surname. | M | |
| 3 | O'brien | Irish | Surname. | M | |
| 4 | O'keefe | Irish | Surname. | M | |
| 5 | O'shay | Irish | Surname. | M | |
| 6 | O'shea | Irish | Surname. | M | |
| 7 | Oakden | English | From the oak tree valley. | M | |
| 8 | Oakes | English | From the oak. | M | |
| 9 | Oakley | English | From the oak - tree meadow. | M | |
| 10 | Oates | German | Variant of Odo: Wealth. | M | |
| 11 | Oba | Egyptian | King. | M | |
| 12 | Obadiah | Biblical | Servant of the Lord | M | |
| 13 | Obadiah | Hebrew | Servant/worshipper of the Lord. Obadiah was the prophet who wrote the shortest book in the Old Testament. | M | |
| 14 | Obal | Biblical | Inconvenience of old age. | M | |
| 15 | Obed | Biblical | A servant; workman | M | |
| 16 | Obed-edom | Biblical | Servant of Edom | M | |
| 17 | Obediah | Hebrew | Serves God. | M | |
| 18 | Oberon | English | In A Midsummer Night's Dream, Shakespeare altered the spelling to Auberon, king of the fairies, to Oberon. | M | |
| 19 | Oberon | German | Noble and bear-like. In a Midsummer Night's Dream, Shakespeare altered the spelling of Auberon (King of the fairies) to Oberon. | M | |
| 20 | Oberon | Shakespearean | A Midsummer Night's Dream' King of the Fairies. | M | |
| 21 | Obiareus | Greek | A Titan. | M | |
| 22 | Obil | Biblical | That weeps, who deserves to be bewailed. | M | |
| 23 | Oboth | Biblical | 'Dragons, fathers, desires' | M | |
| 24 | Oceanus | Greek | Father of the Oceanids. | M | |
| 25 | Ocelfa | English | From the high plain. | M | |
| 26 | Ocnus | Greek | Incompetent. | M | |
| 27 | Ocran | Biblical | A disturber, that disorders. | M | |
| 28 | Octave | French | Born eighth. | M | |
| 29 | Octavian | Latin | Variant of Octavius: Born eighth. Octavian was the name used commonly for the Emperor Augustus. | M | |
| 30 | Octavio | Latin | Eighth. | M | |
| 31 | Octavius | Latin | Born eighth. Octavius was a Roman clan name, as well as the original name of Emperor Augustus (commonly known as Octavian). Traditionally, this name was given to the eighth child in a large family. | M | |
| 32 | Octavius | Shakespearean | Antony and Cleopatra'. Octavius Caesar, Roman triumvir. 'The Tragedy of Julius Caesar' Triumvir after Caesar's death, later Augustus Caesar, first emperor of Rome. | M | |
| 33 | Octe | Anglo-Saxon | A son of Hengist. | M | |
| 34 | Octha | Anglo-Saxon | A son of Hengist. | M | |
| 35 | Octha | ArthurianLegend | Enemy of Arthur. | M | |
| 36 | Ocumwhowurst | NativeAmerican | Yellow wolf (Cheyenne). | M | |
| 37 | Ocunnowhurst | NativeAmerican | Yellow wolf (Cheyenne). | M | |
| 38 | Ocvran | ArthurianLegend | Father of Guinevere. | M | |
| 39 | Odakota | NativeAmerican | Friend (Sioux). | M | |
| 40 | Odale | English | Of the valley. | M | |
| 41 | Odam | English | Son in law. | M | |
| 42 | Odanodan | Irish | Of the red earth. | M | |
| 43 | Odayle | English | Of the valley. | M | |
| 44 | Odbart | German | Wealthy. | M | |
| 45 | Odd | Norse | Point. | M | |
| 46 | Oddie | German | Variant of Odo: Wealth. | M | |
| 47 | Oddleif | Norse | Point descendant. | M | |
| 48 | Oddvar | Norse | Pointable. | M | |
| 49 | Ode | Teutonic | Rich. | M | |
| 50 | Oded | Biblical | To sustain, hold or lift up. | M | |