Kassidy is a moderately popular girls' name in United States, ranking #423 in 2005 with 733 recorded births. The name reached its all-time peak in 2000 with 1,007 births ranking #314. Since 1996, the popularity has increased by 25.1%. In 2005, approximately 1 in every 2,521 girls born was named Kassidy. FALLING Recent data shows the name is currently falling.