Cassidy is a distinctive boys' name in United States, ranking #2671 in 2014 with 45 recorded births. The name reached its all-time peak in 1996 with 78 births ranking #1371. Since 1996, the popularity has decreased by 42.3%. In 2014, approximately 1 in every 42,676 boys born was named Cassidy. STABLE Recent data shows the name is currently stable.