Cassidie is a distinctive girls' name in United States, ranking #5850 in 2005 with 21 recorded births. The name reached its all-time peak in 1998 with 31 births ranking #3745. Since 1996, the popularity has decreased by 16.0%. In 2005, approximately 1 in every 87,986 girls born was named Cassidie. FALLING Recent data shows the name is currently falling.