Is Oneil a boy or girl name?

Oneil is a boy’s name. Of the 1,774 Americans recorded with the name since 1880, 1.0% were girls and 99.0% were boys.

Oneil

Recorded 1892–2025 · United States

Oneil was most popular in 1924, when 43 American babies were given the name — ranking #2,202 that year. In 2025 it ranked #20,040, with 7 births. Across 1880–2025 the Social Security Administration has recorded 1,774 people named Oneil.

Oneil over time

Births per year. The dot marks Oneil’s peak in 1924. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Oneil a boy’s or a girl’s name?

Across the whole record Oneil is a boy’s name — 1.0% of the 1,774 Americans given it were girls and 99.0% were boys. In births since 2016 it is 0% girls and 100% boys.

Counted from every US birth the Social Security Administration recorded under this name, so it reflects use rather than opinion. A name given to fewer than five babies of one sex in a year is withheld at source and is not counted.

Names that peaked alongside Oneil

Where Oneil is most concentrated

How much more common the name is in each state than across the country as a whole.

Explore further

See Oneil on the interactive charts

Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org