This is a list of the most common male names starting with the letter O, based on people currently estimated to be alive in the United States as of 2024.
| Name | People | Average Age |
|---|---|---|
| Owen | 216,688 | 14.6 |
| Oliver | 215,926 | 12.0 |
| Oscar | 139,431 | 31.3 |
| Omar | 99,487 | 25.0 |
| Orlando | 41,565 | 35.6 |
| Otis | 26,042 | 50.4 |
| Orion | 21,014 | 13.4 |
| Otto | 16,057 | 23.6 |
| Osvaldo | 13,894 | 25.2 |
| Omari | 12,581 | 14.4 |
| Odin | 12,390 | 7.7 |
| Octavio | 10,277 | 27.8 |
| Oakley | 9,360 | 6.6 |
| Orville | 6,495 | 66.3 |
| Ollie | 6,057 | 55.2 |
| Onyx | 5,923 | 5.1 |
| Oswaldo | 5,577 | 25.7 |
| Odell | 5,474 | 59.4 |
| Oren | 5,231 | 31.6 |
| Olin | 4,384 | 39.0 |
| Ocean | 4,000 | 8.8 |
| Omarion | 3,910 | 16.4 |
| Osman | 3,644 | 14.7 |
| Obed | 3,602 | 22.3 |
| Ozzy | 3,599 | 7.7 |
| Octavius | 3,444 | 26.6 |
| Omer | 3,416 | 33.6 |
| Orin | 3,381 | 33.5 |
| Osiris | 3,353 | 13.0 |
| Orrin | 3,274 | 35.5 |
| Oskar | 3,101 | 13.2 |
| Osbaldo | 2,965 | 27.4 |
| Osiel | 2,831 | 15.8 |
| Olen | 2,712 | 48.8 |
| Odis | 2,609 | 59.5 |
| Oziel | 2,455 | 13.9 |
| Ozzie | 2,408 | 27.2 |
| Obadiah | 2,253 | 16.6 |
| Om | 2,235 | 12.4 |
| Otha | 2,231 | 64.0 |
| Osmar | 2,216 | 15.7 |
| Olivier | 1,887 | 18.2 |
| Oswald | 1,854 | 36.1 |
| Orson | 1,844 | 21.2 |
| Oran | 1,785 | 45.6 |
| Ozias | 1,663 | 4.8 |
| Obie | 1,600 | 51.8 |
| Octavious | 1,593 | 25.6 |
| Ori | 1,519 | 13.0 |
| Octavian | 1,404 | 16.4 |
| Oneal | 1,364 | 52.1 |
| Oden | 1,319 | 9.2 |
| Ottis | 1,243 | 58.5 |
| Oakland | 1,223 | 4.7 |
| Orval | 1,194 | 71.2 |
| Oshea | 1,157 | 15.9 |
| Olan | 1,143 | 42.6 |
| Oryan | 1,078 | 16.3 |
| Oneil | 1,035 | 38.3 |
| Otoniel | 1,028 | 24.6 |
| Ora | 948 | 66.8 |
| Olaf | 939 | 42.1 |
| Oaklee | 936 | 4.6 |
| Osama | 933 | 27.3 |
| Ocie | 919 | 62.9 |
| Ovidio | 886 | 35.6 |
| Omri | 852 | 14.3 |
| Ontario | 844 | 30.7 |
| Obinna | 840 | 22.4 |
| Ozell | 787 | 61.9 |
| Omid | 760 | 24.8 |
| Owyn | 753 | 10.6 |
| Ole | 741 | 37.8 |
| Omega | 739 | 35.3 |
| Odie | 732 | 61.5 |
| Oumar | 715 | 12.5 |
| Olivia | 703 | 16.8 |
| Oral | 687 | 65.2 |
| Ousmane | 675 | 12.1 |
| Orlin | 674 | 37.4 |
| Oaklen | 659 | 3.4 |
| Othniel | 656 | 10.6 |
| Osborne | 645 | 45.5 |
| Oz | 638 | 9.6 |
| Olajuwon | 617 | 26.4 |
| Ojas | 596 | 9.3 |
| Olando | 579 | 39.1 |
| Orie | 578 | 49.8 |
| Oak | 571 | 6.5 |
| Ossie | 570 | 68.3 |
| Orian | 563 | 17.9 |
| Oluwatobi | 548 | 17.0 |
| Osmin | 529 | 17.9 |
| Orland | 520 | 60.0 |
| Oziah | 519 | 4.8 |
| Otho | 517 | 68.9 |
| Oslo | 500 | 3.9 |
| Othman | 497 | 12.2 |
| Oisin | 487 | 11.4 |
| Odysseus | 479 | 7.4 |