Cassidey is a distinctive girls' name in United States, ranking #17637 in 2006 with 5 recorded births. The name reached its all-time peak in 2001 with 11 births ranking #8879. Since 1996, the popularity has decreased by 16.7%. In 2006, approximately 1 in every 380,214 girls born was named Cassidey. FALLING Recent data shows the name is currently falling.