Alonzo has been given to about 46,109 people in the United States since 1880. It was most common in 2022, which makes it a current name.
Alonzo ranks 511th among American boys in 2025, with 590 born that year. Its best year was 2022, when 651 babies were given the name, ranking 471st. The typical living American called Alonzo is about 36 years old today. It is relatively most common in Nevada, where it accounts for 0.05% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.