Reilly is a distinctive girls' name in United States, ranking #2855 in 2025 with 60 recorded births. This places Reilly in the top 17% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1998 with 379 births ranking #623. Since 1996, the popularity has decreased by 65.3%. In 2025, approximately 1 in every 26,788 girls born was named Reilly. RISING Recent data shows the name is currently rising.