Kassidy is a moderately popular girls' name in United States, ranking #366 in 1998 with 784 recorded births. The name reached its all-time peak in 2000 with 1,007 births ranking #314. Since 1996, the popularity has increased by 33.8%. In 1998, approximately 1 in every 2,254 girls born was named Kassidy. FALLING Recent data shows the name is currently falling.