Cydney
A respelling of Sydney, from the English surname Sidney, which is traced either to the Norman Saint-Denis or to Old English words for a wide island.
Cydney in 2025
Cydney was given to 9 babies in the United States in 2025, making it the 17,438th most popular name of the year. That is roughly one in every 368,371 babies born.
The history of Cydney
Cydney reached its highest point in 2000, when 230 babies were given the name, ranking 1,659th that year. Its best-ever ranking was 1,591st, in 1996.
Across the 84 years of records since 1942, 5,170 babies have been named Cydney. Half of them were born before 1997, which places the name's centre of gravity with Generation Z.
Cydney by decade
| Decade | Babies named Cydney | Best rank |
|---|---|---|
| 1940s | 49 | 3,540 |
| 1950s | 333 | 2,560 |
| 1960s | 313 | 3,046 |
| 1970s | 196 | 4,412 |
| 1980s | 438 | 2,725 |
| 1990s | 1,775 | 1,591 |
| 2000s | 1,442 | 1,659 |
| 2010s | 520 | 3,979 |
| 2020s | 104 | 8,267 |
Where Cydney is heading
Cydney has fallen 78% over the past decade, from 41 babies in 2015 to 9 in 2025.
That is less than 5% of its 2000 peak — Cydney is now a rare name in the United States.
Names like Cydney
Names that rose and fell at the same time as Cydney.