Dillyn
Dillyn reached its high-water mark in 1999 at number 3,279, and has been recorded 634 times in all. It is given to both boys and girls. It has not appeared in the national data since 2023. About 630 Dillyns are alive in the United States today, and half of them are over 18.
Popularity, 1880–2025
girls named Dillyn boys named Dillyn
Girls and boys called Dillyn
years more girls than boys years more boys than girls
Both, throughout, without either side ever taking it over: 222 girls and 412 boys in all, and in 2015 the split was 13 to 14.
The girls’ share of each year’s babies of the name, in the 10 years in which at least 25 babies got it. The line touches the middle more often than there are crossings marked: a year or two on the other side is not a name changing hands, and only a move that holds for 5 counted years and reaches 60/40 is recorded as one. All 581 names that changed sex.
By the numbers
- Total US births
- 634
- Estimated living today
- 630
- Median age today
- 18
- Peak year
- 1999
- Best rank
- 3,279th
- Rank in 2025
- unranked
- First recorded
- 1991
- Girls / boys
- 222 / 412
How old the living Dillyns are
born that year still alive today
Of the 634 babies given the name since 1991, about 630 are alive — 99 in every hundred. The dotted line is the median: half were born before 2007 and half after.
An estimate, not a count. SSA births aged forward through SSA cohort life tables, which know nothing about who left the country or arrived in it — so for a name that mostly came to America rather than being born in it, this is a floor rather than a figure. Where you fall among living Americans.
Names of 1999
The most popular boys’ names the year Dillyn peaked:
Related names
Dillyn against another name
Two names on one chart, with the year one overtook the other.
Try it on yourself
Source: US Social Security Administration, national and state baby-name files, 1880–2025. Counts include only births registered with the SSA, and names with fewer than five births in a year are not published. The living estimate applies SSA cohort life tables to those births; it counts people born in the United States, so it misses anyone who arrived later and anyone who has left.