Cassidy is a moderately popular girls' name in United States, ranking #496 in 2023 with 617 recorded births. The name reached its all-time peak in 1999 with 3,395 births ranking #99. Since 1996, the popularity has decreased by 78.3%. In 2023, approximately 1 in every 2,597 girls born was named Cassidy. STABLE Recent data shows the name is currently stable.