Cassidee is a distinctive girls' name in United States, ranking #4470 in 1999 with 25 recorded births. The name reached its all-time peak in 2014 with 38 births ranking #3939. Since 1996, the popularity has increased by 47.1%. In 1999, approximately 1 in every 70,951 girls born was named Cassidee. FALLING Recent data shows the name is currently falling.