Reilly is a distinctive boys' name in United States, ranking #1205 in 2012 with 149 recorded births. This places Reilly in the top 8% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2007 with 218 births ranking #911. In 2012, approximately 1 in every 12,729 boys born was named Reilly. FALLING Recent data shows the name is currently falling.