NameCensus.

UK boy's name

O'neil

A masculine name of Irish origin meaning "descendant of the passionate one".

For 2026, the newest official UK baby-name figures on this page are from 2009. That release is the current official benchmark rather than a forecast.

O'neil is a boy's name in the UK records. People looking for O'neil popularity in 2026 should use the latest official release, which is 2009 in this profile. In that release it ranked #4527, with 3 babies registered with the name. Its strongest year in the published records was 2003, with 11 births.

This profile covers 20 England and Wales registrations across 4 recorded years from 1996 to 2009. The figures come from ONS England and Wales, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.

The latest count is about 27% of the recorded peak, which gives a quick read on how the name has moved since its high point.

We estimate that about 20 living people in the UK are called O'neil. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2010 or 2026.

Key insights

  • O'neil ranked #4527 for boys in England and Wales in 2009, with 3 registrations.
  • The name peaked in 2003, when 11 boys were registered as O'neil.
  • About 20 living people in the UK are estimated to have O'neil as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#4527

2009

Births in 2009

3

Latest year

Peak year

2003

11 births

Estimated living

20

2026

Meaning

What does O'neil mean?

The name Oneil has its origins in the Gaelic language, tracing back to Ireland and Scotland in the Middle Ages. It is a variant spelling of the name Niall, which itself derives from the Old Irish word "Niall" or "Nial," meaning "champion" or "cloud."

The name Niall was popular among ancient Irish kings and nobility, with one of the earliest recorded instances being Niall Noígiallach, an Irish king who ruled in the 5th century AD. He was known as Niall of the Nine Hostages, and his descendants went on to establish several powerful dynasties in Ireland, including the Uí Néill.

Oneil emerged as an anglicized spelling of the name Niall, particularly among Irish families who migrated to English-speaking regions or adopted English naming conventions. This variant spelling became more prevalent in the 17th and 18th centuries, during the waves of Irish immigration to the Americas and other parts of the world.

One of the earliest recorded instances of the Oneil spelling can be found in the writings of Edmund Spenser, an English poet who lived in Ireland during the 16th century. In his work "A View of the Present State of Ireland," Spenser mentions "the great O'Neale" in reference to the powerful O'Neill dynasty.

Throughout history, several notable individuals have borne the first name Oneil or its variant spellings. One of the most famous was Oneil Longmuir (1875-1949), a Scottish actor and playwright who was a prominent figure in the early 20th century Scottish Renaissance movement.

Another notable figure was Oneil Desiderio (1842-1913), an Italian-American musician and composer who is credited with introducing Italian opera to the United States. He was a renowned conductor and founded the Desiderio Opera Company in New York City.

In the realm of sports, Oneil Cruz (born 1998) is a prominent baseball player from the Dominican Republic, currently playing for the Pittsburgh Pirates in Major League Baseball.

Oneil Banton (born 1988) is a Jamaican reggae artist and songwriter, known for his collaborations with various dancehall and reggae artists.

Finally, Oneil Balkaran (1912-1989) was a Trinidadian lawyer and politician who served as the first President of Trinidad and Tobago after the country gained independence from the United Kingdom in 1976.

Sourced from namecensus.com.

Popularity

O'neil over time

The chart below shows babies named O'neil registered in England and Wales in the years where the name appears in the published records, from 1996 to 2009. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.

For O'neil, the clearest high point is 2003. The latest England and Wales figure is 3 births in 2009, compared with 11 at the peak.

Babies born per year

O'neil
036811199620022009

Decades

O'neil by decade

Decade totals smooth out the yearly jumps and make it easier to see whether O'neil was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.

Decade Average rank Total births Years covered
2000s #3450 17 3
1990s #2863 3 1

Related

Names similar to O'neil

FAQ

O'neil: questions and answers

How popular is the name O'neil in the UK right now?

In 2009, O'neil was ranked #4527 for boys in England and Wales, with 3 births registered.

When was O'neil most popular?

The peak year on record was 2003, with 11 babies registered as O'neil in England and Wales.

What is the meaning and origin of O'neil?

A masculine name of Irish origin meaning "descendant of the passionate one".

How many people are called O'neil in the UK?

A total of 20 babies have been registered as O'neil across the 4 years of ONS England & Wales records shown here.

Which records is this page based on?

The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.