Kay vs Kaydyn
American parents have registered 102,545 Kays since 1880, against 574 Kaydyns. Kay is still ahead, with 47 babies in 2025.
Babies given each name, 1880–2025
Kay Kaydyn
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
Of the 142 years in which either name was published, Kay for 140 years and Kaydyn for 2 years. The lead changed hands 2 times.
Side by side
| Kay | Kaydyn | |
|---|---|---|
| Total US births | 102,545 | 574 |
| Most in one year | 3,718 | 53 |
| Babies in 2025 | 47 | 9 |
| Estimated living today | 62,000 | 570 |
| Median age today | 73 | 13 |
| Peak year | 1942 | 2009 |
| Best rank | 75th girls | 3,639th boys |
| Rank in 2025 | 3,903rd | 8,243rd |
| First recorded | 1882 | 2000 |
| Girls / boys | 98,621 / 3,924 | 228 / 346 |
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 Kays alive today are over 73; half the Kaydyns are over 13. That is 60 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: Kay and Kaydyn.