Cassidy is a distinctive girls' name in England & Wales, ranking #729 in 2018 with 54 recorded births. The name reached its all-time peak in 2010 with 67 births ranking #586. Since 1996, the popularity has increased by 237.5%. In 2018, approximately 1 in every 5,338 girls born was named Cassidy. FALLING Recent data shows the name is currently falling.