Cassidy is a distinctive boys' name in United States, ranking #2025 in 2004 with 59 recorded births. The name reached its all-time peak in 1996 with 78 births ranking #1371. Since 1996, the popularity has decreased by 24.4%. In 2004, approximately 1 in every 33,641 boys born was named Cassidy. STABLE Recent data shows the name is currently stable.