Over the past 110 years, 35 670 boys have been named Alonzo. The name Alonzo ranks 542th in the United States among the most common names for boys. For the first time more than ten times newborns were named Alonzo in 1910. The peak of popularity of the name Alonzo came in the 1910s and 2010s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.