212 American girls' names begin with O, ranked by how many babies have carried each one since 1880. Olivia leads the letter with 568,136 recorded.
| Name | Meaning | 2025 births | |
|---|---|---|---|
| Olivia | Olive tree; peace | 13,554 | |
| Opal | Edwardian name | 740 | |
| Olive | current name | 1,604 | |
| Olga | Edwardian name | 50 | |
| Ora | Edwardian name | 40 | |
| Ola | interwar name | 13 | |
| Ophelia | current name | 1,183 | |
| Octavia | current name | 982 | |
| Odessa | interwar name | 193 | |
| Oaklynn | current name | 1,973 | |
| Oma | Edwardian name | — | |
| Ofelia | interwar name | 87 | |
| Ona | Edwardian name | 21 | |
| Orpha | Edwardian name | — | |
| Oralia | midcentury name | 12 | |
| Oleta | interwar name | — | |
| Oaklyn | current name | 479 | |
| Ouida | interwar name | — | |
| Odette | current name | 303 | |
| Oakleigh | current name | 423 | |
| Oriana | millennial-parent name | 113 | |
| Olympia | Gen X and millennial name | 84 | |
| Odalys | Gen X and millennial name | 39 | |
| Odelia | current name | 56 | |
| Odalis | Gen X and millennial name | 11 | |
| Olyvia | millennial-parent name | 48 | |
| Ozella | interwar name | 7 | |
| Oneida | Edwardian name | — | |
| Onie | Edwardian name | — | |
| Oliva | Gen X and millennial name | 16 | |
| Olevia | interwar name | — | |
| Oona | current name | 62 | |
| Otilia | interwar name | 18 | |
| Oneta | interwar name | — | |
| Orlaith | Golden princess | 65 | |
| Orianna | millennial-parent name | 53 | |
| Olene | interwar name | — | |
| October | current name | 49 | |
| Olivia-Rose | current name | 42 | |
| Odilia | interwar name | 16 | |
| Oletha | interwar name | — | |
| Otelia | interwar name | — | |
| Omie | interwar name | — | |
| Onita | interwar name | — | |
| Oretha | interwar name | — | |
| Oceana | millennial-parent name | 43 | |
| Ottilie | current name | 57 | |
| Olinda | midcentury name | — | |
| Oksana | Gen X and millennial name | 15 | |
| Orene | Edwardian name | — | |
| Onalee | interwar name | 8 | |
| Orelia | interwar name | 10 | |
| Olena | current name | 21 | |
| Olean | interwar name | — | |
| Oneita | interwar name | — | |
| Odella | Edwardian name | 7 | |
| Orly | millennial-parent name | 29 | |
| Omayra | boomer-era name | — | |
| Ondrea | Gen X and millennial name | — | |
| Odile | Edwardian name | — | |
| Olivette | interwar name | 26 | |
| Odyssey | current name | 35 | |
| Osa | Edwardian name | 9 | |
| Oumou | millennial-parent name | 35 | |
| Oaklie | current name | 54 | |
| Oliviah | millennial-parent name | 9 | |
| Othella | interwar name | — | |
| Orma | interwar name | — | |
| Onika | boomer-era name | 11 | |
| Oralee | Edwardian name | — | |
| Onna | current name | 12 | |
| Orlena | interwar name | — | |
| Olivea | millennial-parent name | 7 | |
| Olivia-Grace | current name | 19 | |
| Orlagh | current name | 28 | |
| Odetta | interwar name | — | |
| Odessia | interwar name | — | |
| Ottilia | Edwardian name | 13 | |
| Odessie | interwar name | — | |
| Oneda | interwar name | — | |
| Orlean | interwar name | — | |
| Olla | interwar name | — | |
| Olivia-Mae | current name | 19 | |
| Orli | current name | 22 | |
| Otila | interwar name | — | |
| Ohana | current name | 40 | |
| Oceanna | millennial-parent name | 5 | |
| Ofilia | interwar name | — | |
| Opha | Edwardian name | — | |
| Odelle | Edwardian name | — | |
| Olivya | millennial-parent name | 11 | |
| Oliviana | current name | 21 | |
| Olimpia | Gen X and millennial name | 12 | |
| Oriah | current name | 18 | |
| Ovella | interwar name | — | |
| Omaira | boomer-era name | 5 | |
| Orlene | interwar name | — | |
| Oline | Edwardian name | — | |
| Osmara | millennial-parent name | 12 | |
| Ozelle | Edwardian name | — | |
| Oletta | interwar name | 6 | |
| Othelia | Edwardian name | — | |
| Orlinda | midcentury name | — | |
| Olina | current name | 13 | |
| Orena | interwar name | — | |
| Ortencia | midcentury name | — | |
| Odeal | Edwardian name | — | |
| Olivia-May | millennial-parent name | 8 | |
| Orchid | current name | 9 | |
| Ople | interwar name | — | |
| Ogechi | Gen X and millennial name | 7 | |
| Oria | Edwardian name | 5 | |
| Orah | Edwardian name | 10 | |
| Oliwia | millennial-parent name | 9 | |
| Olivianna | current name | 11 | |
| Oni | current name | — | |
| Opel | interwar name | — | |
| Oleda | interwar name | — | |
| Odaliz | Gen X and millennial name | — | |
| Omara | current name | 9 | |
| Onica | Gen X and millennial name | — | |
| Oonagh | current name | 11 | |
| Olar | Edwardian name | — | |
| Okla | Edwardian name | — | |
| Ortha | interwar name | — | |
| Oneisha | Gen X and millennial name | — | |
| Omelia | current name | 13 | |
| Oluwakemi | millennial-parent name | — | |
| Ornella | millennial-parent name | 6 | |
| Orvilla | Edwardian name | — | |
| Oanh | Gen X and millennial name | — | |
| Oliviagrace | current name | 13 | |
| Oriyah | current name | 25 | |
| Omaria | millennial-parent name | 9 | |
| Olia | midcentury name | — | |
| Oliana | current name | 12 | |
| Orilla | Edwardian name | — | |
| Oreta | interwar name | — | |
| Oretta | Edwardian name | — | |
| Olivine | current name | 13 | |
| Obera | Edwardian name | — | |
| Oveta | midcentury name | — | |
| Ota | Edwardian name | — | |
| Oliviarose | current name | 11 | |
| Opaline | interwar name | 11 | |
| Oleva | interwar name | — | |
| Oceane | current name | 10 | |
| Oveda | interwar name | — | |
| Oluchi | millennial-parent name | — | |
| Onesty | millennial-parent name | 8 | |
| Oaklynne | current name | 23 | |
| Onya | Gen X and millennial name | — | |
| Olwen | current name | 12 | |
| Olamae | Edwardian name | — | |
| Ovida | interwar name | — | |
| Onetta | Edwardian name | — | |
| Oza | Edwardian name | — | |
| Octavie | interwar name | — | |
| Ophia | interwar name | — | |
| Olanna | current name | 20 | |
| Odesser | Edwardian name | — | |
| Orine | interwar name | — | |
| Olivia-Mai | millennial-parent name | 3 | |
| Oyuki | Gen X and millennial name | — | |
| Ohanna | current name | 8 | |
| Onedia | interwar name | — | |
| Obdulia | boomer-era name | — | |
| Olani | current name | 33 | |
| Octa | Edwardian name | — | |
| Otillia | Edwardian name | 8 | |
| Otisha | Gen X and millennial name | — | |
| Oviya | millennial-parent name | 6 | |
| Orvetta | interwar name | — | |
| Omunique | Gen X and millennial name | — | |
| Omah | Edwardian name | — | |
| Oreatha | interwar name | — | |
| Ondine | millennial-parent name | — | |
| Onyinyechi | millennial-parent name | — | |
| Orra | Edwardian name | — | |
| Olivia-Rae | current name | 9 | |
| Olenna | current name | 23 | |
| Olita | Edwardian name | — | |
| Orla-Rose | current name | 12 | |
| Onelia | Edwardian name | — | |
| Ohemaa | current name | 13 | |
| Oriya | current name | 10 | |
| Odester | interwar name | — | |
| Oneka | boomer-era name | — | |
| Olivene | Edwardian name | — | |
| Orit | boomer-era name | — | |
| Omolara | millennial-parent name | — | |
| Ocia | interwar name | — | |
| Ourania | boomer-era name | 5 | |
| Omolola | boomer-era name | — | |
| Oluwatoyin | Gen X and millennial name | — | |
| Ottillie | current name | 27 | |
| Onesti | millennial-parent name | 8 | |
| Ovetta | Edwardian name | — | |
| Orean | Edwardian name | — | |
| Olivet | current name | 14 | |
| Onda | Edwardian name | — | |
| Oaklei | current name | 12 | |
| Onesha | Gen X and millennial name | — | |
| Olesya | millennial-parent name | — | |
| Orella | Edwardian name | — | |
| Oyinkansola | current name | 5 | |
| Orpah | interwar name | — | |
| Omeka | boomer-era name | — | |
| Oluwateniola | millennial-parent name | 3 | |
| Orabelle | interwar name | — | |
| Orphia | Edwardian name | — | |
| Orlah | current name | — |
Source: US Social Security Administration, 2025 release.