Boys' name · peaked in 1909
Alfonso name popularity since 1925
37,829 babies born in the US from 1925 to 2025 were named Alfonso. Half of them were born in 1978 or earlier, so the typical Alfonso is about 48 years old in 2026. Alfonso peaked in 1909 as the #302 name for boys, and it was outside the top 1,000 in 2025.
Key facts
- US babies since 1925
- 37,829
- Named Alfonso, 1925–2025
- Peak year
- 1909
- #302 for boys that year
- In 2025
- Not top 1,000
- #1,012 for boys in 2025
- Girls / boys
- 99.7% boys
- 109 girls · 37,720 boys
- Most popular in
- New Mexico
- 5.83× its national share
Peak year is the year Alfonso 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.
Alfonso births per year, 1925–2025
The biggest year on this chart was 1991. Measured as a share of all babies, Alfonso peaked earlier, in 1909.
- Steepest fall: Between 2007 and 2012, Alfonso's share of baby boys fell by 38%, from 1 in 4,160 to 1 in 6,700.
Shaded on the chart. This compares Alfonso's share of all US boys five years apart, counting only years with at least 100 babies named Alfonso.
Decade by decade
Babies named Alfonso 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 | 5 | 1,688 | – |
| 1930s | 11 | 2,986 | #336 |
| 1940s | 12 | 2,987 | #373 |
| 1950s | 11 | 3,819 | #368 |
| 1960s | 16 | 3,775 | #401 |
| 1970s | 26 | 4,115 | #374 |
| 1980s | 22 | 4,537 | #395 |
| 1990s | 6 | 5,201 | #454 |
| 2000s | 0 | 4,508 | #534 |
| 2010s | 0 | 2,680 | #796 |
| 2020–25 | 0 | 1,424 | #1,012 |
Ranks count every name given to at least 5 boys that year, so they can go past 1,000.
Generation fingerprint
20.7% of babies named Alfonso from 1925 to 2025 were born in the Millennial years (1981–1996). The full split by generation:
Where Alfonso is most popular
The index compares Alfonso'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 Alfonso.
| State | Index | Babies |
|---|---|---|
| New Mexico | 5.83× | 1,091 |
| Texas | 3.23× | 8,575 |
| Arizona | 3.21× | 1,410 |
| California | 3.10× | 11,105 |
| Colorado | 1.62× | 675 |
Other spellings
Spellings that sound like Alfonso 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 |
|---|---|---|
| Alfonso (this page) | 37,720 | 1909 |
| Alfonzo | 5,311 | 1909 |
Names with a similar story
Of the other 1999 names on this site, these six had the share of babies closest in shape to Alfonso's from 1925 to 2025, however common each one got. Each line is scaled to its own high; the dashed line is Alfonso.
Names from the same era
Other common names that peaked within two years of Alfonso (1909).
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