| Odell | 995 1571 2566 |
| Oliver | 513 1044 1557 |
| Oscar | 456 1081 1537 |
| Om | 493 1010 1503 |
| Omar | 523 973 1496 |
| Octavia | 519 638 1157 |
| Ollie | 612 534 1146 |
| Omkar | 310 755 1065 |
| Owen | 360 667 1027 |
| Olga | 409 251 660 |
| Oma | 10 32 42 |
| Ojas | 10 29 39 |
| Omid | 7 29 36 |
| Orla | 8 27 35 |
| Ozzy | 9 26 35 |
| Orion | 8 27 35 |
| Olaf | 6 26 32 |
| Ori | 8 23 31 |
| Oz | 10 19 29 |
| Odin | 13 16 29 |
| Obie | 5 5 10 |
| Ostin | 2 8 10 |
| Omari | 1 9 10 |
| Oreste | 2 8 10 |
| Obinna | 4 5 9 |
| Ova | 3 6 9 |
| Oather | 0 9 9 |
| Olin | 1 8 9 |
| Olvin | 2 6 8 |
| Oisin | 4 4 8 |
| Oumar | 1 4 5 |
| Obrien | 2 3 5 |
| Opie | 1 4 5 |
| Olegario | 0 5 5 |
| Omri | 1 4 5 |
| Ottie | 0 4 4 |
| Orley | 1 3 4 |
| Ojani | 0 4 4 |
| Oluwafemi | 0 4 4 |
| Ondre | 2 2 4 |
| Orazio | 1 2 3 |
| Oryan | 1 2 3 |
| Osmel | 0 3 3 |
| Omeed | 0 3 3 |
| Orton | 0 3 3 |
| Ottis | 0 3 3 |
| Obrian | 1 2 3 |
| Okey | 1 2 3 |
| Ozias | 0 3 3 |
| Oland | 0 3 3 |
| Ohn | 0 2 2 |
| Olney | 0 2 2 |
| Onaje | 0 2 2 |
| Oran | 1 0 1 |
| Ollin | 1 0 1 |
| Orry | 1 0 1 |
| Olajuwon | 0 1 1 |
| Osten | 0 1 1 |
| Oshae | 0 1 1 |
| Orlyn | 1 0 1 |