Mostly boys · peaked in 1912
Sidney name popularity since 1925
82,030 babies born in the US from 1925 to 2025 were named Sidney (28.7% girls, 71.3% boys). Half of them were born in 1963 or earlier, so the typical Sidney is about 63 years old in 2026. Sidney peaked in 1912 as the #80 name for boys, and it was outside the top 1,000 in 2025.
Key facts
- US babies since 1925
- 82,030
- Named Sidney, 1925–2025
- Peak year
- 1912
- #80 for boys that year
- In 2025
- Not top 1,000
- #1,327 for boys in 2025
- Girls / boys
- 71.3% boys
- 23,580 girls · 58,450 boys
- Most popular in
- Louisiana
- 3.23× its national share
Peak year is the year Sidney made up the largest share of US boys, in records going back to 1880. Typical age is based on births from 1925 on, not on who is living today.
Sidney births per year, 1925–2025
The biggest year on this chart was 1927. Measured as a share of all babies, Sidney peaked earlier, in 1912.
- Steepest fall: Between 2000 and 2005, Sidney's share of baby boys fell by 34%, from 1 in 5,900 to 1 in 9,000.
Shaded on the chart. This compares Sidney's share of all US boys five years apart, counting only years with at least 100 babies named Sidney.
Decade by decade
Babies named Sidney in each decade, and its rank among boys' names in the middle year of the decade (1935, 1945 … 2025).
| Decade | Girls | Boys | Rank |
|---|---|---|---|
| 1925–29 | 282 | 6,340 | – |
| 1930s | 697 | 9,420 | #153 |
| 1940s | 951 | 9,608 | #186 |
| 1950s | 892 | 9,632 | #225 |
| 1960s | 571 | 6,844 | #298 |
| 1970s | 327 | 3,817 | #418 |
| 1980s | 781 | 3,333 | #460 |
| 1990s | 6,964 | 3,829 | #503 |
| 2000s | 8,401 | 2,729 | #838 |
| 2010s | 2,894 | 1,991 | #1,088 |
| 2020–25 | 820 | 907 | #1,327 |
Ranks count every name given to at least 5 boys that year, so they can go past 1,000.
Generation fingerprint
23.3% of babies named Sidney from 1925 to 2025 were born in the Baby Boom years (1946–1964). The full split by generation:
Where Sidney is most popular
The index compares Sidney's share of babies in each state with its share nationwide, 1925–2025 (1.50× = 50% more common). States with at least 300 babies named Sidney.
| State | Index | Babies |
|---|---|---|
| Louisiana | 3.23× | 4,302 |
| Mississippi | 2.54× | 2,283 |
| Alabama | 1.89× | 2,480 |
| Georgia | 1.63× | 3,340 |
| South Carolina | 1.58× | 1,644 |
Names with a similar story
Of the other 1999 names on this site, these six had the share of babies closest in shape to Sidney's from 1925 to 2025, however common each one got. Each line is scaled to its own high; the dashed line is Sidney.
Names from the same era
Other common names that peaked within two years of Sidney (1912).
Source: U.S. Social Security Administration national and state baby-name data, which covers names given to at least 5 babies of one sex in a year. About the data