Alfonzo has been given to about 5,783 people in the United States since 1880. It was most common in 1970, which makes it a boomer-era name.
Its best year was 1970, when 90 babies were given the name, ranking 848th. The typical living American called Alfonzo is about 49 years old today. It is relatively most common in California, where it accounts for 0.00% of births.
Source: US Social Security Administration, national and state name files, 2025 release. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.