How Many People Are Named Alonzo?
An estimated 32,242 people in the United States have the first name Alonzo. It is almost exclusively a male name. The average bearer is 38 years old, and Alonzo peaked in popularity in 2022 with 651 births that year.
Below you will find a full statistical profile of Alonzo as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Alonzo paired with any surname.
Key Insights
- While Alonzo is overwhelmingly male, 154 female births have been registered with this name since 1880.
Estimated Living Americans
32,242
About 1 in 10,631 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
99.7% confidence
Average Age
38
years old
Peak Year
2022
651 births
Total Registered
45,514
since 1880
Gender Distribution for Alonzo
Alonzo is almost exclusively a male name. Out of 45,514 total births registered, 99.7% were male.
Alonzo as a male name
Ranked #512 in 2024
594 male births in 2024
Peak: 2022 (651 births)
Alonzo as a female name
Ranked #9,279 in 1988
7 female births in 1988
Peak: 1955 (8 births)
Alonzo: Popularity Over Time
SSA records for Alonzo span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 2010s, when 5,250 babies were registered. While Alonzo is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Alonzo by Decade
How has Alonzo tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
| Decade | Total | Male | Female | |
|---|---|---|---|---|
| 1880s | 1,088 | 1,088 | 0 | |
| 1890s | 879 | 879 | 0 | |
| 1900s | 808 | 808 | 0 | |
| 1910s | 2,218 | 2,218 | 0 | |
| 1920s | 2,996 | 2,986 | 10 | |
| 1930s | 2,434 | 2,434 | 0 | |
| 1940s | 2,652 | 2,647 | 5 | |
| 1950s | 4,003 | 3,966 | 37 | |
| 1960s | 4,419 | 4,394 | 25 | |
| 1970s | 3,523 | 3,491 | 32 | |
| 1980s | 3,664 | 3,619 | 45 | |
| 1990s | 4,262 | 4,262 | 0 | |
| 2000s | 4,328 | 4,328 | 0 | |
| 2010s | 5,250 | 5,250 | 0 | |
| 2020s | 2,990 | 2,990 | 0 | |
Alonzo by State
Birth registrations for Alonzo span all 44 states and territories in the SSA database. The highest counts are in California, Texas, Illinois. The lowest are in Rhode Island, New Hampshire, Alaska. On average, about 875 Alonzos were registered per state.
Alonzo + Last Name Combinations
How many people share a full name with Alonzo as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Alonzo
Other first names starting with A with a similar number of bearers.
Alonzo: Questions and Answers
How many people in the U.S. are named Alonzo?
We estimate approximately 32,242 people named Alonzo are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 10,631 Americans share this first name.
Is Alonzo a common name?
Alonzo is classified as "Uncommon" and is more popular than 98.9% of all first names in the SSA database. A total of 45,514 births have been registered with this name since 1880.
When was Alonzo most popular?
Alonzo reached peak popularity in 2022, when 651 babies were given this name. The average age of a living person named Alonzo is approximately 38 years old, reflecting when the name was most commonly given.
Is Alonzo a male name?
Alonzo is predominantly male. 99.7% of people with this name are male. See the gender breakdown above for full details.
How many Alonzo Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Alonzo Smith, Alonzo Johnson, Alonzo Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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