Over the past 110 years, 35 042 boys have been named Alfonso. The name Alfonso ranks 545th in the United States among the most common names for boys. For the first time more than ten times newborns were named Alfonso in 1910. The peak of popularity of the name Alfonso came in the 1920s and 1990s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.