Cassidy is a distinctive girls' name in England & Wales, ranking #749 in 2019 with 51 recorded births. The name reached its all-time peak in 2010 with 67 births ranking #586. Since 1996, the popularity has increased by 218.8%. In 2019, approximately 1 in every 5,491 girls born was named Cassidy. FALLING Recent data shows the name is currently falling.