Cassidie is a distinctive girls' name in United States, ranking #17083 in 2014 with 5 recorded births. The name reached its all-time peak in 1998 with 31 births ranking #3745. Since 1996, the popularity has decreased by 80.0%. In 2014, approximately 1 in every 357,187 girls born was named Cassidie. FALLING Recent data shows the name is currently falling.