Cassidy is a distinctive boys' name in United States, ranking #1371 in 1996 with 78 recorded births. This places Cassidy in the top 13% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1996 with 78 births ranking #1371. In 1996, approximately 1 in every 24,285 boys born was named Cassidy. STABLE Recent data shows the name is currently stable.