Recorded 1880–2025 · United States
Lilly was most popular in 2010, when 2,891 American babies were given the name — ranking #249 that year. In 2025 it ranked #538, with 1,218 births. Across 1880–2025 the Social Security Administration has recorded 66,752 people named Lilly.
The Social Security Administration’s records begin in 1880, and Lilly is already there in that first year — so the name is older than the record and these figures cannot date it. It has been recorded in 146 of the 146 years since.
The Social Security Administration has recorded 66,752 American births named Lilly 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 55,242 are estimated to be alive today.
1,218 American babies were named Lilly in 2025, ranking #538 that year.
Lilly is falling. Across 2021–2025 it averaged 1,262 births a year, against 2,638 a year across 2011–2015 — a change of -52% 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.
Across the whole record Lilly is a girl’s name — 100.0% of the 66,752 Americans given it were girls and 0.0% were boys. In births since 2016 it is 100% girls and 0% 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.
Roughly 55,242 Americans named Lilly are alive today — 83% of everyone ever recorded with the name. The median is 15 years old, and half are between 10 and 21. That is a narrow band because Lilly is a young name — it only became common recently, so almost everyone carrying it is still a child or a young adult.
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.
How much more common the name is in each state than across the country as a whole.
See Lilly on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org