Cassidy is a distinctive girls' name in United States, ranking #541 in 2025 with 558 recorded births. The name reached its all-time peak in 1999 with 3,395 births ranking #99. Since 1996, the popularity has decreased by 80.4%. In 2025, approximately 1 in every 2,880 girls born was named Cassidy. STABLE Recent data shows the name is currently stable.