Cassidie is a distinctive girls' name in United States, ranking #6219 in 1997 with 15 recorded births. The name reached its all-time peak in 1998 with 31 births ranking #3745. Since 1996, the popularity has decreased by 40.0%. In 1997, approximately 1 in every 116,044 girls born was named Cassidie. FALLING Recent data shows the name is currently falling.