Girl Names Starting With O
6 US girl names beginning with O, each linking to scored middle, sibling and twin name pairings. Sorted A–Z; switch to popularity below.
- Oakley Old English siblings · twins
- Oaklynn American siblings · twins
- Octavia Latin siblings · twins
- Olive Latin siblings · twins
- Olivia English siblings · twins
- Ophelia Greek siblings · twins
No names match those filters.
How common are O names?
About 1 in 59 US girls born in 2025 has a first name beginning with O: 27,135 girls, or 1.69% of the year's recorded births. That is up from 0.32% in 1990.
| Name | Rank in 2015 | Rank in 2025 |
|---|---|---|
| Olivia | #2 | #1 |
| Oaklynn | #3,019 | #153 |
| Olive | #264 | #197 |
| Ophelia | #980 | #264 |
| Octavia | #1,361 | #308 |
Of these names, Oaklynn has moved up the most in ten years — #3,019 for girls in 2015, #153 in 2025.
On the middle-name pages, a middle name that also starts with O loses points. A doubled O in the initials is something some parents like and others avoid.
Girl Names starting with O
This page lists 6 girl names beginning with the letter O that are in real current use in the United States — including popular picks like Olivia, Oaklynn, Oakley. The count comes from US Social Security Administration public records: every name shown was given to at least a handful of US babies in the latest year, so this is not a list of invented or one-off spellings.
Open any name to see its pairing page — middle names, sibling names and twin names, each scored for how well it fits. Use the sort control above to switch between A–Z and 2025 popularity. To browse a different letter, go back to all girl names.