Boy Names Starting With O
8 US boy 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
- Oliver Latin siblings · twins
- Omar Arabic siblings · twins
- Onyx Greek siblings · twins
- Orion Greek siblings · twins
- Oscar Irish siblings · twins
- Otto Germanic siblings · twins
- Owen Welsh siblings · twins
No names match those filters.
O names by the numbers
About 1 in 45 US boys born in 2025 has a first name beginning with O: 38,087 boys, or 2.23% of the year's recorded births. That is up from 0.44% in 1990.
| Name | Rank in 2015 | Rank in 2025 |
|---|---|---|
| Oliver | #19 | #3 |
| Owen | #36 | #31 |
| Oscar | #181 | #223 |
| Omar | #217 | #260 |
| Otto | #544 | #277 |
Of these names, Oliver has moved up the most in ten years — #19 for boys in 2015, #3 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.
Boy Names starting with O
This page lists 8 boy names beginning with the letter O that are in real current use in the United States — including popular picks like Oliver, Owen, 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 boy names.