Adelfo is a distinctive boys' name in United States, ranking #11060 in 2008 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 2008, approximately 1 in every 339,991 boys born was named Adelfo. STABLE Recent data shows the name is currently stable.