Recorded 1975–2025 · United States
Dillan was most popular in 1992, when 341 American babies were given the name — ranking #1,199 that year. In 2025 it ranked #6,835, with 37 births. Across 1880–2025 the Social Security Administration has recorded 7,387 people named Dillan.
Dillan first appears in Social Security Administration records in 1975, which makes it about 50 years old as a recorded American name. It has been recorded in 47 of the 51 years since.
The Social Security Administration has recorded 7,387 American births named Dillan 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 7,240 are estimated to be alive today.
37 American babies were named Dillan in 2025, ranking #6,835 that year.
Dillan is falling. Across 2021–2025 it averaged 56 births a year, against 155 a year across 2011–2015 — a change of -64% 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 Dillan is mostly a boy’s name — 5.3% of the 7,387 Americans given it were girls and 94.7% were boys. In births since 2016 it is 17% girls and 83% 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 7,240 Americans named Dillan are alive today — 98% of everyone ever recorded with the name. The median is 23 years old, and half are between 17 and 30.
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.
A variant of Dylan · Welsh · "great tide"
How much more common the name is in each state than across the country as a whole.
See Dillan on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org