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 2023.
| Name | People | Average Age |
|---|---|---|
| Owen | 209,496 | 14.2 |
| Oliver | 201,070 | 12.0 |
| Oscar | 138,724 | 31.0 |
| Omar | 98,295 | 24.4 |
| Orlando | 41,469 | 35.0 |
| Otis | 26,258 | 50.7 |
| Orion | 19,960 | 13.2 |
| Otto | 14,998 | 25.2 |
| Osvaldo | 13,769 | 24.5 |
| Omari | 12,126 | 13.9 |
| Odin | 11,749 | 7.1 |
| Octavio | 10,169 | 27.3 |
| Oakley | 8,589 | 6.5 |
| Orville | 6,796 | 66.3 |
| Ollie | 5,985 | 56.4 |
| Odell | 5,613 | 59.4 |
| Oswaldo | 5,546 | 24.9 |
| Oren | 5,148 | 31.9 |
| Onyx | 4,989 | 5.0 |
| Olin | 4,396 | 39.4 |
| Omarion | 3,861 | 15.6 |
| Obed | 3,530 | 21.9 |
| Ocean | 3,513 | 8.9 |
| Osman | 3,429 | 14.6 |
| Omer | 3,397 | 34.1 |
| Octavius | 3,374 | 26.2 |
| Orin | 3,354 | 33.6 |
| Orrin | 3,263 | 35.5 |
| Ozzy | 3,125 | 7.9 |
| Osiris | 3,118 | 12.8 |
| Oskar | 3,005 | 12.6 |
| Osbaldo | 2,958 | 26.5 |
| Olen | 2,738 | 49.5 |
| Odis | 2,679 | 59.5 |
| Osiel | 2,668 | 15.8 |
| Otha | 2,301 | 63.6 |
| Ozzie | 2,292 | 28.7 |
| Oziel | 2,251 | 14.2 |
| Om | 2,168 | 11.8 |
| Osmar | 2,157 | 15.1 |
| Obadiah | 2,120 | 16.7 |
| Olivier | 1,839 | 17.7 |
| Oswald | 1,807 | 37.1 |
| Oran | 1,801 | 45.8 |
| Orson | 1,736 | 22.0 |
| Obie | 1,620 | 52.1 |
| Octavious | 1,583 | 24.8 |
| Ori | 1,407 | 13.2 |
| Oneal | 1,384 | 52.3 |
| Ozias | 1,383 | 4.8 |
| Octavian | 1,341 | 16.2 |
| Ottis | 1,272 | 59.0 |
| Orval | 1,261 | 70.9 |
| Oden | 1,255 | 8.7 |
| Olan | 1,145 | 43.3 |
| Oshea | 1,109 | 15.6 |
| Oakland | 1,072 | 4.5 |
| Oryan | 1,048 | 15.8 |
| Oneil | 1,041 | 38.1 |
| Otoniel | 1,017 | 23.9 |
| Ora | 982 | 67.0 |
| Olaf | 945 | 41.8 |
| Ocie | 938 | 63.6 |
| Osama | 920 | 26.7 |
| Oaklee | 854 | 4.2 |
| Ovidio | 853 | 36.4 |
| Ontario | 838 | 30.0 |
| Obinna | 830 | 21.7 |
| Omri | 813 | 14.2 |
| Ozell | 808 | 61.6 |
| Omid | 752 | 24.1 |
| Odie | 747 | 61.9 |
| Ole | 732 | 38.3 |
| Owyn | 728 | 10.0 |
| Oral | 710 | 64.8 |
| Omega | 703 | 35.6 |
| Olivia | 689 | 16.4 |
| Oumar | 685 | 12.0 |
| Orlin | 664 | 38.8 |
| Osborne | 645 | 46.4 |
| Ousmane | 635 | 11.8 |
| Othniel | 626 | 10.1 |
| Olajuwon | 610 | 25.8 |
| Oz | 597 | 9.2 |
| Ossie | 587 | 68.0 |
| Orie | 586 | 50.1 |
| Olando | 581 | 38.1 |
| Oaklen | 561 | 3.1 |
| Ojas | 555 | 9.0 |
| Orian | 544 | 17.6 |
| Oluwatobi | 542 | 16.2 |
| Otho | 542 | 68.6 |
| Orland | 539 | 59.8 |
| Osmin | 514 | 17.4 |
| Oak | 511 | 6.3 |
| Othman | 471 | 11.9 |
| Obrian | 468 | 26.7 |
| Omarr | 466 | 33.5 |
| Ociel | 463 | 18.0 |
| Oisin | 461 | 11.1 |