Llewellyn
Recorded 1880–2025 · United States
Llewellyn was most popular in 1918, when 79 American babies were given the name — ranking #1,487 that year. In 2025 it ranked #8,448, with 27 births. Across 1880–2025 the Social Security Administration has recorded 3,755 people named Llewellyn.
Llewellyn over time
How old is the name Llewellyn?
The Social Security Administration’s records begin in 1880, and Llewellyn 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 138 of the 146 years since.
How many people are named Llewellyn?
The Social Security Administration has recorded 3,755 American births named Llewellyn 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 1,531 are estimated to be alive today.
How many babies were named Llewellyn in 2025?
27 American babies were named Llewellyn in 2025, ranking #8,448 that year.
Is Llewellyn getting more or less popular?
Llewellyn is too rare for a direction to mean much. It averaged 20 births a year across 2021–2025 against 9 a year a decade earlier — at these counts a single baby moves the percentage, and any year under five births is withheld at source.
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 Llewellyn a boy’s or a girl’s name?
Across the whole record Llewellyn is mostly a boy’s name — 9.1% of the 3,755 Americans given it were girls and 90.9% were boys. In births since 2016 it is 32% girls and 68% 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 Llewellyn?
Roughly 1,531 Americans named Llewellyn are alive today — 41% of everyone ever recorded with the name. The median is 60 years old, and half are between 41 and 72. That is a wide band, the mark of a name in steady use across generations rather than a passing fashion.
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 Llewellyn is most concentrated
How much more common the name is in each state than across the country as a whole.
Explore further
See Llewellyn on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org