Reilly is a distinctive boys' name in United States, ranking #872 in 1999 with 174 recorded births. This places Reilly in the top 8% of ranked US boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2007 with 218 births ranking #911. Since 1996, the popularity has increased by 21.7%. In 1999, approximately 1 in every 11,035 boys born was named Reilly. FALLING Recent data shows the name is currently falling.