Cassidy is a distinctive boys' name in United States, ranking #2092 in 2008 with 66 recorded births. The name reached its all-time peak in 1996 with 78 births ranking #1371. Since 1996, the popularity has decreased by 15.4%. In 2008, approximately 1 in every 30,908 boys born was named Cassidy. STABLE Recent data shows the name is currently stable.