Sydney vs Sidney
Sydney leads today (#348 vs #1,323), though both are past their peak.
145 years, head to head
Babies named Sydney and Sidney per year in U.S. Social Security records, 1880–2025.
Head to head
2025 rank
#348 (girls)
#1,323 (boys)
Babies named in 2025
873
146
Peak year
2000
1912
Trend
Declining since 2000
Declining since 1994
Usually for
Girls
Girls & boys
Lifetime births
178,296
84,202
Try another matchup
Sydney against names whose popularity has moved like its own.