This is a list of the most common female 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 |
|---|---|---|
| Olivia | 484,693 | 15.5 |
| Olga | 24,266 | 54.0 |
| Olive | 19,036 | 19.6 |
| Octavia | 15,849 | 26.4 |
| Opal | 13,835 | 55.1 |
| Ophelia | 10,711 | 29.9 |
| Ora | 8,740 | 67.3 |
| Ollie | 8,609 | 59.0 |
| Oakley | 7,684 | 6.9 |
| Odessa | 6,646 | 51.5 |
| Ola | 6,163 | 70.3 |
| Ofelia | 5,954 | 46.4 |
| Oaklynn | 4,205 | 1.6 |
| Oralia | 4,149 | 56.6 |
| Oriana | 3,373 | 18.3 |
| Odalys | 3,252 | 19.7 |
| Oaklee | 3,021 | 3.8 |
| Oaklyn | 2,935 | 2.5 |
| Odalis | 2,552 | 20.0 |
| Odette | 2,508 | 29.2 |
| Olyvia | 2,460 | 13.8 |
| Ocean | 2,407 | 9.7 |
| Ona | 2,368 | 53.3 |
| Olympia | 2,205 | 32.9 |
| Oakleigh | 2,011 | 3.0 |
| Oma | 1,680 | 72.8 |
| Ouida | 1,530 | 71.8 |
| Oona | 1,444 | 14.7 |
| Odelia | 1,293 | 40.5 |
| Oliva | 1,260 | 28.4 |
| Oleta | 1,229 | 73.3 |
| Omega | 1,224 | 36.7 |
| Orianna | 1,198 | 13.7 |
| Oneida | 1,194 | 49.9 |
| Onyx | 1,058 | 5.6 |
| October | 1,034 | 12.0 |
| Oceana | 988 | 15.4 |
| Oksana | 945 | 25.0 |
| Otilia | 898 | 48.9 |
| Osiris | 816 | 12.6 |
| Odilia | 789 | 56.1 |
| Omayra | 785 | 39.1 |
| Orpha | 782 | 71.4 |
| Ondrea | 766 | 35.3 |
| Odell | 750 | 59.3 |
| Ocie | 726 | 64.2 |
| Orly | 713 | 17.5 |
| Oscar | 705 | 30.4 |
| Oliviah | 667 | 10.0 |
| Orla | 667 | 19.3 |
| Ossie | 648 | 67.4 |
| Onika | 639 | 27.8 |
| Oumou | 634 | 10.3 |
| Odyssey | 612 | 15.0 |
| Ozella | 601 | 69.2 |
| Olivea | 597 | 14.1 |
| Onna | 587 | 25.0 |
| Olevia | 582 | 57.4 |
| Oaklie | 532 | 5.7 |
| Onita | 529 | 66.4 |
| Orion | 526 | 12.6 |
| Owen | 505 | 13.6 |
| Oretha | 492 | 69.4 |
| Olinda | 454 | 58.2 |
| Onalee | 446 | 42.5 |
| Omar | 438 | 23.2 |
| Olena | 422 | 29.4 |
| Oliver | 421 | 12.4 |
| Oceanna | 421 | 16.1 |
| Oletha | 417 | 66.8 |
| Orli | 415 | 12.7 |
| Olivya | 378 | 10.4 |
| Omaira | 370 | 37.7 |
| Otha | 368 | 62.7 |
| Omari | 364 | 13.2 |
| Oliviana | 330 | 5.8 |
| Orelia | 327 | 62.9 |
| Oriah | 313 | 8.8 |
| Oluwadarasimi | 312 | 5.3 |
| Ohana | 311 | 4.8 |
| Oneta | 305 | 77.4 |
| Osmara | 305 | 18.0 |
| Otis | 300 | 51.6 |
| Otelia | 294 | 71.7 |
| Olimpia | 293 | 35.1 |
| Olamide | 291 | 12.6 |
| Ogechi | 285 | 21.5 |
| Onnie | 277 | 69.7 |
| Omni | 269 | 14.5 |
| Odaliz | 266 | 19.7 |
| Ozzie | 266 | 32.4 |
| Osha | 264 | 29.5 |
| Odetta | 264 | 63.2 |
| Olene | 262 | 79.9 |
| Oliwia | 257 | 11.7 |
| Oni | 256 | 18.1 |
| Onica | 254 | 27.8 |
| Oluwadamilola | 252 | 12.0 |
| Oneisha | 247 | 26.2 |
| Olina | 243 | 8.7 |