In 2025, 21 US boys were named Alphonso, making it the 4,712th most common boys’ name of the year, up 742 places from #5,454 in 2024. That is 4 more than the 17 boys named Alphonso in 2024. Its best rank for boys was #376, reached in 1900. The most boys given the name in a single year was 319, in 1962. For comparison, it was #4,300 in 2015 and #457 in 1950.
Social Security card records list Alphonso in 141 years of the 146 from 1880 to 2025, starting in 1880 with 5 babies. In all, 15,214 US babies have been given the name, 0.2% of them girls and 99.8% boys. Its busiest decade was the 1950s, with 2,768 babies named Alphonso.
Over the 10 years from 2016 to 2025, 233 US boys were named Alphonso; the busiest of those years was 2017, with 33. In 2025 that was about 1 in 81,337 of the boys in SSA’s list for the year.
Related spellings in the SSA files include Alfonso (41,579 babies since 1880). Rarer spellings such as Alphonzo and Alphonsus are summarised on this page.