Dillan vs Dillyn
American parents have registered 7,387 Dillans since 1880, against 634 Dillyns. Dillan is still ahead, with 37 babies in 2025.
Babies given each name, 1880–2025
Dillan Dillyn
Each line is every baby given the name that year, girls and boys added together — the only count that means the same thing for both names. A line breaks where the name fell below five babies in a year — the point at which the SSA stops publishing it — rather than being drawn through a figure nobody published. A single published year in a gap shows as a dot.
Who was ahead
Dillan has been the commoner name in every year either was published, 1975 to 2025. The lead has never changed hands.
The closest they came was 2020, when Dillan had 65 and Dillyn had 15.
Side by side
| Dillan | Dillyn | |
|---|---|---|
| Total US births | 7,387 | 634 |
| Most in one year | 341 | 32 |
| Babies in 2025 | 37 | under 5 |
| Estimated living today | 7,200 | 630 |
| Median age today | 22 | 18 |
| Peak year | 1992 | 1999 |
| Best rank | 553rd boys | 3,279th boys |
| Rank in 2025 | 3,848th | unranked |
| First recorded | 1975 | 1991 |
| Girls / boys | 393 / 6,994 | 222 / 412 |
A rank is a position within one sex’s list for one year, so the two rank rows are not subtracted from one another and the winning column is not marked on them. The living figure is a life-table estimate, not a count.
Which name is older
Half of the Dillans alive today are over 22; half the Dillyns are over 18. That is 4 years between them: two names in use at the same time, worn by two different generations.
Compare something else
Related comparisons
Social Security Administration birth records, 1880–2025, public domain. Full histories: Dillan and Dillyn.