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 2021.
| Name | People | Average Age |
|---|---|---|
| Owen | 193,680 | 13.6 |
| Oliver | 172,183 | 12.4 |
| Oscar | 137,052 | 30.4 |
| Omar | 95,842 | 23.2 |
| Orlando | 41,201 | 33.8 |
| Otis | 26,536 | 51.6 |
| Orion | 18,112 | 12.6 |
| Osvaldo | 13,546 | 23.0 |
| Otto | 13,096 | 29.2 |
| Omari | 11,078 | 13.2 |
| Octavio | 9,949 | 26.2 |
| Odin | 9,831 | 6.4 |
| Orville | 7,435 | 66.1 |
| Oakley | 7,012 | 6.9 |
| Odell | 5,894 | 59.3 |
| Ollie | 5,855 | 59.0 |
| Oswaldo | 5,475 | 23.4 |
| Oren | 4,971 | 32.8 |
| Olin | 4,376 | 40.7 |
| Omarion | 3,761 | 14.0 |
| Obed | 3,378 | 21.2 |
| Omer | 3,370 | 35.2 |
| Orin | 3,278 | 34.2 |
| Orrin | 3,224 | 35.8 |
| Octavius | 3,210 | 25.7 |
| Onyx | 2,988 | 5.6 |
| Osman | 2,983 | 14.8 |
| Osbaldo | 2,939 | 24.8 |
| Odis | 2,829 | 59.4 |
| Olen | 2,815 | 50.4 |
| Oskar | 2,748 | 11.7 |
| Osiris | 2,644 | 12.6 |
| Ocean | 2,577 | 9.7 |
| Otha | 2,442 | 62.7 |
| Osiel | 2,370 | 15.7 |
| Ozzy | 2,148 | 9.6 |
| Ozzie | 2,067 | 32.4 |
| Om | 2,049 | 10.5 |
| Osmar | 2,029 | 14.1 |
| Oziel | 1,992 | 14.0 |
| Obadiah | 1,893 | 16.9 |
| Oran | 1,841 | 46.0 |
| Oswald | 1,738 | 38.9 |
| Olivier | 1,726 | 17.0 |
| Obie | 1,661 | 52.7 |
| Octavious | 1,539 | 23.6 |
| Orson | 1,499 | 24.5 |
| Oneal | 1,438 | 52.2 |
| Orval | 1,402 | 70.3 |
| Ottis | 1,338 | 59.7 |
| Ori | 1,253 | 13.0 |
| Octavian | 1,224 | 15.7 |
| Olan | 1,146 | 44.7 |
| Oden | 1,065 | 8.4 |
| Ora | 1,064 | 67.3 |
| Oneil | 1,052 | 37.8 |
| Oshea | 1,005 | 15.1 |
| Ocie | 993 | 64.2 |
| Oryan | 992 | 14.7 |
| Ozias | 981 | 4.6 |
| Otoniel | 978 | 23.0 |
| Olaf | 961 | 41.4 |
| Osama | 893 | 25.5 |
| Ozell | 850 | 61.1 |
| Ontario | 834 | 28.3 |
| Ovidio | 802 | 37.6 |
| Obinna | 798 | 20.6 |
| Odie | 778 | 62.6 |
| Oakland | 763 | 4.1 |
| Oral | 758 | 63.9 |
| Omri | 746 | 13.4 |
| Ole | 724 | 39.0 |
| Omid | 723 | 23.1 |
| Owyn | 674 | 8.9 |
| Olivia | 669 | 15.5 |
| Orlin | 663 | 41.0 |
| Osborne | 642 | 48.2 |
| Oumar | 638 | 10.9 |
| Oaklee | 624 | 3.8 |
| Omega | 621 | 36.7 |
| Ossie | 621 | 67.4 |
| Olajuwon | 600 | 24.2 |
| Otho | 595 | 67.9 |
| Orie | 594 | 51.3 |
| Olando | 582 | 36.6 |
| Orland | 574 | 60.1 |
| Ousmane | 561 | 11.4 |
| Othniel | 557 | 9.3 |
| Oluwatobi | 528 | 14.5 |
| Orian | 524 | 16.9 |
| Oz | 523 | 8.5 |
| Ojas | 481 | 8.3 |
| Osmin | 479 | 16.7 |
| Omarr | 468 | 31.5 |
| Obrian | 461 | 25.2 |
| Orlanda | 457 | 49.9 |
| Omero | 448 | 29.8 |
| Ociel | 446 | 16.7 |
| Octaviano | 441 | 45.0 |
| Oris | 440 | 65.6 |