Cassidy is a distinctive boys' name in United States, ranking #1949 in 2006 with 69 recorded births. The name reached its all-time peak in 1996 with 78 births ranking #1371. Since 1996, the popularity has decreased by 11.5%. In 2006, approximately 1 in every 29,784 boys born was named Cassidy. STABLE Recent data shows the name is currently stable.