Reilly is a distinctive girls' name in United States, ranking #1437 in 2009 with 163 recorded births. This places Reilly in the top 7% 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. In 2009, approximately 1 in every 11,269 girls born was named Reilly. RISING Recent data shows the name is currently rising.