Cassidy is a distinctive boys' name in England & Wales, ranking #3684 in 2025 with 5 recorded births. The name reached its all-time peak in 2020 with 21 births ranking #1230. Since 1996, the popularity has decreased by 16.7%. In 2025, approximately 1 in every 54,387 boys born was named Cassidy. FALLING Recent data shows the name is currently falling.