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 2022.
| Name | People | Average Age |
|---|---|---|
| Owen | 201,877 | 13.8 |
| Oliver | 186,801 | 12.2 |
| Oscar | 137,980 | 30.6 |
| Omar | 97,140 | 23.8 |
| Orlando | 41,329 | 34.4 |
| Otis | 26,417 | 51.2 |
| Orion | 19,115 | 12.8 |
| Otto | 13,990 | 27.1 |
| Osvaldo | 13,639 | 23.8 |
| Omari | 11,631 | 13.5 |
| Odin | 10,852 | 6.7 |
| Octavio | 10,060 | 26.8 |
| Oakley | 7,801 | 6.6 |
| Orville | 7,109 | 66.2 |
| Ollie | 5,927 | 57.7 |
| Odell | 5,751 | 59.3 |
| Oswaldo | 5,512 | 24.2 |
| Oren | 5,056 | 32.4 |
| Olin | 4,396 | 39.9 |
| Onyx | 3,910 | 5.2 |
| Omarion | 3,811 | 14.8 |
| Obed | 3,453 | 21.5 |
| Omer | 3,387 | 34.6 |
| Orin | 3,336 | 33.7 |
| Octavius | 3,289 | 26.0 |
| Orrin | 3,244 | 35.7 |
| Osman | 3,211 | 14.6 |
| Ocean | 3,045 | 9.1 |
| Osbaldo | 2,945 | 25.7 |
| Oskar | 2,882 | 12.1 |
| Osiris | 2,878 | 12.7 |
| Olen | 2,772 | 50.0 |
| Odis | 2,753 | 59.5 |
| Ozzy | 2,599 | 8.6 |
| Osiel | 2,493 | 15.9 |
| Otha | 2,371 | 63.2 |
| Ozzie | 2,172 | 30.4 |
| Oziel | 2,127 | 14.1 |
| Om | 2,105 | 11.2 |
| Osmar | 2,095 | 14.6 |
| Obadiah | 2,010 | 16.8 |
| Oran | 1,821 | 45.9 |
| Olivier | 1,784 | 17.3 |
| Oswald | 1,767 | 38.0 |
| Obie | 1,644 | 52.3 |
| Orson | 1,615 | 23.2 |
| Octavious | 1,562 | 24.2 |
| Oneal | 1,412 | 52.2 |
| Ori | 1,334 | 13.1 |
| Orval | 1,330 | 70.6 |
| Ottis | 1,306 | 59.3 |
| Octavian | 1,284 | 15.9 |
| Ozias | 1,166 | 4.7 |
| Oden | 1,165 | 8.5 |
| Olan | 1,140 | 44.2 |
| Oshea | 1,057 | 15.4 |
| Oneil | 1,046 | 37.9 |
| Oryan | 1,028 | 15.1 |
| Ora | 1,022 | 67.2 |
| Otoniel | 1,000 | 23.4 |
| Ocie | 965 | 64.0 |
| Olaf | 954 | 41.6 |
| Oakland | 924 | 4.2 |
| Osama | 903 | 26.2 |
| Ontario | 839 | 29.0 |
| Ozell | 829 | 61.4 |
| Ovidio | 827 | 37.0 |
| Obinna | 810 | 21.2 |
| Omri | 770 | 13.9 |
| Odie | 761 | 62.3 |
| Oaklee | 745 | 3.9 |
| Omid | 739 | 23.6 |
| Oral | 734 | 64.3 |
| Ole | 723 | 38.9 |
| Owyn | 707 | 9.4 |
| Olivia | 685 | 15.9 |
| Omega | 672 | 35.9 |
| Orlin | 667 | 39.7 |
| Oumar | 660 | 11.5 |
| Osborne | 646 | 47.0 |
| Ossie | 604 | 67.7 |
| Olajuwon | 599 | 25.2 |
| Ousmane | 589 | 11.8 |
| Orie | 589 | 50.7 |
| Othniel | 588 | 9.7 |
| Olando | 581 | 37.6 |
| Otho | 568 | 68.2 |
| Oz | 558 | 8.9 |
| Orland | 553 | 60.3 |
| Orian | 537 | 17.0 |
| Oluwatobi | 534 | 15.4 |
| Ojas | 523 | 8.5 |
| Osmin | 494 | 17.1 |
| Obrian | 468 | 25.7 |
| Omarr | 467 | 32.5 |
| Omero | 456 | 30.2 |
| Ociel | 455 | 17.3 |
| Oaklen | 455 | 2.9 |
| Orlanda | 454 | 50.8 |
| Oak | 444 | 6.3 |