Cassidy is a distinctive boys' name in United States, ranking #2766 in 2002 with 34 recorded births. The name reached its all-time peak in 1996 with 78 births ranking #1371. Since 1996, the popularity has decreased by 56.4%. In 2002, approximately 1 in every 57,102 boys born was named Cassidy. STABLE Recent data shows the name is currently stable.