Kassidy is a moderately popular girls' name in United States, ranking #324 in 1999 with 948 recorded births. The name reached its all-time peak in 2000 with 1,007 births ranking #314. Since 1996, the popularity has increased by 61.8%. In 1999, approximately 1 in every 1,871 girls born was named Kassidy. FALLING Recent data shows the name is currently falling.