Cassidie is a distinctive girls' name in United States, ranking #5290 in 2002 with 22 recorded births. The name reached its all-time peak in 1998 with 31 births ranking #3745. Since 1996, the popularity has decreased by 12.0%. In 2002, approximately 1 in every 81,674 girls born was named Cassidie. FALLING Recent data shows the name is currently falling.