Cassie is a distinctive girls' name in England & Wales, ranking #515 in 1999 with 56 recorded births. The name reached its all-time peak in 2008 with 133 births ranking #336. Since 1996, the popularity has decreased by 34.1%. In 1999, approximately 1 in every 5,030 girls born was named Cassie. FALLING Recent data shows the name is currently falling.