Alfonso is a distinctive boys' name in United States, ranking #521 in 2007 with 499 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. In 2007, approximately 1 in every 4,159 boys born was named Alfonso. STABLE Recent data shows the name is currently stable.