Is Kiernan a boy or girl name?

Kiernan is a unisex name. Of the 2,448 Americans recorded with the name since 1880, 28.1% were girls and 71.9% were boys.

Name Legacy

Kiernan

Recorded 1957–2025 · United States

Kiernan was most popular in 2008, when 104 American babies were given the name — ranking #3,491 that year. In 2025 it ranked #6,196, with 43 births. Across 1880–2025 the Social Security Administration has recorded 2,448 people named Kiernan.

Kiernan over time

Births per year. The dot marks Kiernan’s peak in 2008. Gaps are years the SSA suppressed, which it does for any name given to fewer than five babies.

Is Kiernan a boy’s or a girl’s name?

Across the whole record Kiernan is a unisex name — 28.1% of the 2,448 Americans given it were girls and 71.9% were boys. In births since 2016 it is 31% girls and 69% 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 Kiernan

Where Kiernan is most concentrated

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

Explore further

See Kiernan on the interactive charts

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