Reilly is a distinctive boys' name in United States, ranking #823 in 2002 with 204 recorded births. The name reached its all-time peak in 2007 with 218 births ranking #911. Since 1996, the popularity has increased by 42.7%. In 2002, approximately 1 in every 9,517 boys born was named Reilly. FALLING Recent data shows the name is currently falling.