Reilly is a distinctive girls' name in United States, ranking #1246 in 2007 with 199 recorded births. The name reached its all-time peak in 1998 with 379 births ranking #623. Since 1996, the popularity has increased by 15.0%. In 2007, approximately 1 in every 9,661 girls born was named Reilly. RISING Recent data shows the name is currently rising.