Oneil
Below 5 births
2025 SSA
About Oneil
Oneil is a masculine name derived from the Gaelic surname Ó Néill, meaning "descendant of Niall." The original Niall was a legendary 4th-century Irish high king, Niall of the Nine Hostages, making this a name with ancient royal connections. The O'Neill clan became one of Ireland's most powerful dynasties, ruling parts of Ulster for centuries. As a first name, Oneil gained modest popularity in the 20th century, particularly in Irish-American communities and Caribbean nations with Irish colonial influence. The name offers a strong connection to Irish heritage while being more distinctive than common Irish names like Patrick or Sean. The single-word spelling (versus O'Neil) simplifies the name while maintaining its cultural roots.
Oneil is also given to girls.
Pronounced oh-NEEL.
As of October 2026, Oneil ranked #5683 for girls in US births in 1924 and #10405 for boys in US births in 2025 SSA, peaked at #4176 for girls in 1918 and #1183 for boys in 1924.
Popularity & trends
Data table
| Year | US rank · girls | Births · girls | US rank · boys | Births · boys |
|---|---|---|---|---|
| 2014 | — | 0 | — | 0 |
| 2015 | — | 0 | — | 0 |
| 2016 | — | 0 | — | 0 |
| 2017 | — | 0 | — | 0 |
| 2018 | — | 0 | — | 0 |
| 2019 | — | 0 | — | 0 |
| 2020 | — | 0 | — | 0 |
| 2021 | — | 0 | — | 0 |
| 2022 | — | 0 | — | 0 |
| 2023 | — | 0 | — | 0 |
| 2024 | — | 0 | — | 0 |
| 2025 | — | 0 | — | 0 |