Cassidy is a moderately popular girls' name in United States, ranking #476 in 2024 with 646 recorded births. The name reached its all-time peak in 1999 with 3,395 births ranking #99. Since 1996, the popularity has decreased by 77.3%. In 2024, approximately 1 in every 2,497 girls born was named Cassidy. STABLE Recent data shows the name is currently stable.