Cassidy is a distinctive girls' name in England & Wales, ranking #807 in 2025 with 45 recorded births. The name reached its all-time peak in 2010 with 67 births ranking #586. Since 1996, the popularity has increased by 181.3%. In 2025, approximately 1 in every 5,628 girls born was named Cassidy. FALLING Recent data shows the name is currently falling.