Top 100 Baby Boy Names That Start With O
| Oliver | Owen |
| Oscar | Omar |
| Orion | Odin |
| Otto | Oakley |
| Onyx | Omari |
| Otis | Ocean |
| Ozzy | Orlando |
| Osiris | Osman |
| Ozias | Ollie |
| Oren | Oakland |
| Oskar | Octavio |
| Osvaldo | Ozzie |
| Oziel | Olin |
| Obadiah | Orson |
| Oaklee | Octavius |
| Orin | Oden |
| Osiel | Obed |
| Om | Oaklen |
| Octavian | Orrin |
| Olivier | Oswald |
| Omer | Ori |
| Oswaldo | Oak |
| Oslo | Oziah |
| Oshea | Omri |
| Omarion | Omega |
| Othniel | Olen |
| Opie | Osmar |
| Oaklyn | Odysseus |
| Oberon | Ojas |
| Oz | Octavious |
| Olliver | Obi |
| Oaks | Odell |
| Olsen | Othman |
| Owyn | Olan |
| Ollivander | Oryan |
| Ostin | Oaklan |
| Oran | Osiah |
| Onix | Odyn |
| Oisin | Ole |
| Omir | Oakes |
| Orhan | Oumar |
| Osias | Ousmane |
| Owais | Olyver |
| Oryn | Ovidio |
| Ozan | Oaklin |
| Obinna | Olvin |
| Oriel | Osmin |
| Oaklynn | Obie |
| Olivander | Omere |
| Onyxx | Orville |
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