Cassidy is a distinctive boys' name in United States, ranking #2418 in 2007 with 53 recorded births. The name reached its all-time peak in 1996 with 78 births ranking #1371. Since 1996, the popularity has decreased by 32.1%. In 2007, approximately 1 in every 39,155 boys born was named Cassidy. STABLE Recent data shows the name is currently stable.