Baby boy names starting with O
| Name | Gender | Origin/Nationality | Name Meaning |
| Oakes | Boy | English | Oak tree |
| Oakley | Boy | English | Oak tree |
| Obadiah | Boy | Hebrew | Servant of the Lord |
| Obaid | Boy | Muslim, Arabic | Small Slave |
| Octavius | Boy | Latin | Eighth born |
| Odell | Boy | Norse | Man of property |
| Ogden | Boy | English | Oak tree valley |
| Ojayit | Boy | Hindu | courageous |
| Okely | Boy | English | Oak tree meadow |
| Olaf | Boy | Norse | Relic |
| Olin | Boy | English | Holly |
| Oliver | Boy | English | Army of the elf |
| Omar | Boy | Arabic | First born |
| Omar | Boy | Arabic | first son, disciple; gifted speaker; famous |
| Omar | Boy | Muslim, Arabic | Long-Lived |
| Omarjeet | Boy | Hindu | |
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