Milly
Recorded 1884–2025 · United States
Milly was most popular in 2014, when 129 American babies were given the name — ranking #2,966 that year. In 2025 it ranked #3,252, with 113 births. Across 1880–2025 the Social Security Administration has recorded 3,347 people named Milly.
Milly over time
How old is the name Milly?
Milly first appears in Social Security Administration records in 1884, which makes it about 141 years old as a recorded American name. It has been recorded in 123 of the 142 years since.
How many people are named Milly?
The Social Security Administration has recorded 3,347 American births named Milly 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 2,793 are estimated to be alive today.
How many babies were named Milly in 2025?
113 American babies were named Milly in 2025, ranking #3,252 that year.
Is Milly getting more or less popular?
Milly is holding steady. Across 2021–2025 it averaged 114 births a year, against 100 a year across 2011–2015 — a change of +14% 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 Milly a boy’s or a girl’s name?
Across the whole record Milly is a girl’s name — 100.0% of the 3,347 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.
How old is someone named Milly?
Roughly 2,793 Americans named Milly are alive today — 83% of everyone ever recorded with the name. The median is 13 years old, and half are between 7 and 23.
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 Milly is most concentrated
How much more common the name is in each state than across the country as a whole.
Explore further
See Milly on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org