Alfonso is a moderately popular boys' name in United States, ranking #493 in 2002 with 468 recorded births. This places Alfonso in the top 4% of ranked US boys' names for the year. Its actual usage is classified as Moderately Popular. The name reached its all-time peak in 1996 with 508 births ranking #440. In 2002, approximately 1 in every 4,148 boys born was named Alfonso. STABLE Recent data shows the name is currently stable.