Cahill is a distinctive boys' name in United States, ranking #9463 in 1997 with 5 recorded births. This places Cahill in the bottom 12% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2001 with 6 births ranking #9427. In 1997, approximately 1 in every 377,018 boys born was named Cahill. STABLE Recent data shows the name is currently stable.