Adelfo is a distinctive boys' name in United States, ranking #10680 in 2006 with 6 recorded births. This places Adelfo in the bottom 24% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2003 with 6 births ranking #9594. In 2006, approximately 1 in every 342,520 boys born was named Adelfo. STABLE Recent data shows the name is currently stable.