Cassidie is a distinctive girls' name in United States, ranking #5748 in 2000 with 19 recorded births. The name reached its all-time peak in 1998 with 31 births ranking #3745. Since 1996, the popularity has decreased by 24.0%. In 2000, approximately 1 in every 95,577 girls born was named Cassidie. FALLING Recent data shows the name is currently falling.