Reilly is a distinctive girls' name in United States, ranking #776 in 2002 with 305 recorded births. The name reached its all-time peak in 1998 with 379 births ranking #623. Since 1996, the popularity has increased by 76.3%. In 2002, approximately 1 in every 5,891 girls born was named Reilly. RISING Recent data shows the name is currently rising.