Kassidy is a moderately popular girls' name in United States, ranking #461 in 2010 with 670 recorded births. The name reached its all-time peak in 2000 with 1,007 births ranking #314. Since 1996, the popularity has increased by 14.3%. In 2010, approximately 1 in every 2,653 girls born was named Kassidy. FALLING Recent data shows the name is currently falling.