Cassie is a moderately popular girls' name in England & Wales, ranking #472 in 2000 with 63 recorded births. The name reached its all-time peak in 2008 with 133 births ranking #336. Since 1996, the popularity has decreased by 25.9%. In 2000, approximately 1 in every 4,336 girls born was named Cassie. FALLING Recent data shows the name is currently falling.