Sydnei vs Sydni
American parents have registered 5,361 Sydnis since 1880, against 635 Sydneis. Sydni is still ahead, with 8 babies in 2025.
Babies given each name, 1880–2025
Sydnei Sydni
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
Sydni has been the commoner name in every year either was published, 1947 to 2025. The lead has never changed hands.
The closest they came was 2015, when Sydnei had 14 and Sydni had 42.
Side by side
| Sydnei | Sydni | |
|---|---|---|
| Total US births | 635 | 5,361 |
| Most in one year | 37 | 468 |
| Babies in 2025 | under 5 | 8 |
| Estimated living today | 630 | 5,300 |
| Median age today | 22 | 24 |
| Peak year | 2005 | 2000 |
| Best rank | 3,876th girls | 557th girls |
| Rank in 2025 | unranked | 10,917th |
| First recorded | 1988 | 1947 |
| Girls / boys | 635 / 0 | 5,361 / 0 |
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 Sydnis alive today are over 24; half the Sydneis are over 22. That is 2 years between them: two names in use at the same time, worn by two different generations.
Where each one is strongest
How much commoner the name is in that state than it is nationally, from births recorded since 1910.
Compare something else
Related comparisons
Social Security Administration birth records, 1880–2025, public domain. Full histories: Sydnei and Sydni.