Boys' name · peaked in 1882
Alonzo name popularity since 1925
39,514 babies born in the US from 1925 to 2025 were named Alonzo. Half of them were born in 1983 or earlier, so the typical Alonzo is about 43 years old in 2026. Alonzo peaked in 1882 as the #111 name for boys, and it ranked #511 in 2025.
Key facts
- US babies since 1925
- 39,514
- Named Alonzo, 1925–2025
- Peak year
- 1882
- #111 for boys that year
- In 2025
- #511
- for boys in 2025 (590 babies)
- Girls / boys
- 99.6% boys
- 154 girls · 39,360 boys
- Most popular in
- District of Columbia
- 2.80× its national share
Peak year is the year Alonzo 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.
Alonzo births per year, 1925–2025
The biggest year on this chart was 2022. Measured as a share of all babies, Alonzo peaked earlier, in 1882.
Decade by decade
Babies named Alonzo 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 | 10 | 1,384 | – |
| 1930s | 0 | 2,434 | #354 |
| 1940s | 5 | 2,647 | #408 |
| 1950s | 37 | 3,966 | #354 |
| 1960s | 25 | 4,395 | #376 |
| 1970s | 32 | 3,490 | #432 |
| 1980s | 45 | 3,619 | #488 |
| 1990s | 0 | 4,262 | #477 |
| 2000s | 0 | 4,329 | #537 |
| 2010s | 0 | 5,251 | #527 |
| 2020–25 | 0 | 3,583 | #511 |
Ranks count every name given to at least 5 boys that year, so they can go past 1,000.
Generation fingerprint
19.3% of babies named Alonzo from 1925 to 2025 were born in the Baby Boom years (1946–1964). The full split by generation:
Where Alonzo is most popular
The index compares Alonzo'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 Alonzo.
| State | Index | Babies |
|---|---|---|
| District of Columbia | 2.80× | 468 |
| Mississippi | 2.28× | 1,000 |
| South Carolina | 2.17× | 1,099 |
| Alabama | 1.75× | 1,125 |
| Arizona | 1.72× | 808 |
Other spellings
Spellings that sound like Alonzo and were given to at least 1,000 boys from 1925 to 2025, with the year each one was most popular.
| Spelling | Boys | Peak year |
|---|---|---|
| Alonzo (this page) | 39,360 | 1882 |
| Alonso | 12,168 | 2010 |
Names with a similar story
Of the other 1999 names on this site, these six had the share of babies closest in shape to Alonzo's from 1925 to 2025, however common each one got. Each line is scaled to its own high; the dashed line is Alonzo.
Names from the same era
Other common names that peaked within two years of Alonzo (1882).
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