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
How old is the name Kiernan?
Kiernan first appears in Social Security Administration records in 1957, which makes it about 68 years old as a recorded American name. It has been recorded in 53 of the 69 years since.
How many people are named Kiernan?
The Social Security Administration has recorded 2,448 American births named Kiernan between 1880 and 2025. That is recorded US births, not a world population — it counts people issued a Social Security number at birth in the United States. Of those, roughly 2,405 are estimated to be alive today.
How many babies were named Kiernan in 2025?
43 American babies were named Kiernan in 2025, ranking #6,196 that year.
Is Kiernan getting more or less popular?
Kiernan is holding steady. Across 2021–2025 it averaged 46 births a year, against 57 a year across 2011–2015 — a change of -18% over the decade.
Measured on recorded births. American births overall have fallen since 2007, so most established names lose births over any recent decade — a name can shed births and still hold its rank. Compare the rank above, which is measured against the other names of the same year.
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.
How old is someone named Kiernan?
Roughly 2,405 Americans named Kiernan are alive today — 98% of everyone ever recorded with the name. The median is 20 years old, and half are between 12 and 27.
An estimate, not a count. Recorded births are carried forward through the Social Security Administration’s 2023 period life table, by age and sex. That table describes mortality in one recent year, so it credits the oldest cohorts with today’s survival rather than the harsher rates they actually lived through — the further back a name peaked, the more this will overstate how many remain. It counts people issued a Social Security number at birth, not immigrants who arrived later.
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
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org