A reliable meaning for Sydnei isn’t established in our sources yet. Rather than guess, we show what is recorded: how the name is used, how often, and the names it’s connected to.
The story
Published U.S. birth records include this spelling as early as 1988. This is the earliest published observation available here, rather than a date for the name’s origin.
From dated birth records
Sydnei through the years
Babies since 1880
635
0 boys · 635 girls
Most popular year
2005
37 babies
2025
0
Outside the ranked list
2021–25 vs 2016–20
−100%
Cooling
Sydnei in U.S. Social Security birth records, 1988–2025, per million girls born. Years with fewer than five births for a sex are not published and appear as zero. Use the arrow keys to step through years.
By the numbers
The most recent published U.S. birth count for girls is 8 in 2020. Later missing counts do not mean the name went unused. Its largest published annual count for girls was 37 in 2005. Published U.S. population figures for this spelling include 565 as a first name in 2020.
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.
Sydnei’s family of names
In Greek usage, Sydnei as a surname is a transliteration of Σύδνεϊ.