Reilly is a distinctive girls' name in United States, ranking #1014 in 2005 with 241 recorded births. The name reached its all-time peak in 1998 with 379 births ranking #623. Since 1996, the popularity has increased by 39.3%. In 2005, approximately 1 in every 7,667 girls born was named Reilly. RISING Recent data shows the name is currently rising.