Cassidie is a distinctive girls' name in United States, ranking #13641 in 2011 with 7 recorded births. The name reached its all-time peak in 1998 with 31 births ranking #3745. Since 1996, the popularity has decreased by 72.0%. In 2011, approximately 1 in every 251,258 girls born was named Cassidie. FALLING Recent data shows the name is currently falling.