Alfonso is a distinctive boys' name in United States, ranking #521 in 2003 with 455 recorded births. This places Alfonso in the top 4% of ranked US boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 1996 with 508 births ranking #440. Since 1996, the popularity has decreased by 10.4%. In 2003, approximately 1 in every 4,341 boys born was named Alfonso. STABLE Recent data shows the name is currently stable.