Kassidy is a moderately popular girls' name in United States, ranking #447 in 2009 with 706 recorded births. The name reached its all-time peak in 2000 with 1,007 births ranking #314. Since 1996, the popularity has increased by 20.5%. In 2009, approximately 1 in every 2,602 girls born was named Kassidy. FALLING Recent data shows the name is currently falling.