Oneil
Meaningdescendant of Niall · Irish
- US rank
- #9,714
- Syllables
- 2
- Peak
- #1,066 in 1892
7 babies were named Oneil in the US in 2025. It has dropped 975 places in five years.
Save adds it to your list. Vote moves it up the top voted names.
US births per million boys, 1892–2025
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Oneil you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- How commonAbout 1 in every 243,902 baby boys born in the US in 2025 was named Oneil, 7 babies in all. In a typical school of 500 kids, your Oneil would very likely be the only one.
- HistoryOneil first shows up in US birth records in 1892, the first year at least 5 babies got it. It has been in use for 133 years since.
- Best yearIt was far more popular in 1892, when it ranked #1,066. Today it's #9,714, so it could be due a comeback.
- Then vs nowOneil was 2.4× more common in 2000 than it is today. In 2000 it was given to about 1 in 103,093 baby boys; in 2025, about 1 in 243,902.
- TrendOneil has slipped 975 places over the last five years and now sits at #9,714. Good news if you want a familiar name that fewer kids will share.
- MeaningIn Irish, Oneil means “descendant of Niall”.
About the name Oneil
Oneil is a boy name of Irish origin meaning “descendant of Niall”. It has 5 letters and 2 syllables, starting with O and ending in “-eil”. US birth records list Oneil for boys from 1892 to 2025, in 113 of those 134 years. Its best year was 1892, when it ranked #1,066 among boy names. In 2025 it ranked #9,714, with 7 babies.
Origin:Irish names
| Decade | Babies per million | About 1 in |
|---|---|---|
| 1890s | 5.1 | 195,122 boys |
| 1910s | 17 | 59,595 boys |
| 1920s | 24 | 41,754 boys |
| 1930s | 18 | 57,013 boys |
| 1940s | 12 | 85,543 boys |
| 1950s | 7.1 | 140,845 boys |
| 1960s | 4.4 | 227,273 boys |
| 1970s | 5.0 | 200,401 boys |
| 1980s | 8.1 | 124,069 boys |
| 1990s | 10 | 98,328 boys |
| 2000s | 9.5 | 105,597 boys |
| 2010s | 6.7 | 150,376 boys |
| 2020s | 4.4 | 225,564 boys |
More Irish boy names
- Boy name: Liam · resolute protector
- Unisex name: Owen · well-born
- Unisex name: Logan · little hollow
- Unisex name: Nolan · descendant of Nuallán
- Unisex name: Gael · a Gael
- Boy name: Arthur · possibly bear
- Unisex name: Ryan · little king
- Boy name: Dominic · of the Lord
Questions about the name Oneil
What does the name Oneil mean?
Oneil means “descendant of Niall” in Irish.
What is the origin of the name Oneil?
Oneil has Irish roots in our records. Other Irish names include Liam, Owen, Logan.
Is Oneil a boy or girl name?
Oneil is a boy name.
How popular is the name Oneil?
Oneil ranked #9,714 for US boys in 2025, given to 7 babies. Its best year was 1892 (#1,066).