Cassie is a moderately popular girls' name in England & Wales, ranking #378 in 2006 with 111 recorded births. The name reached its all-time peak in 2008 with 133 births ranking #336. Since 1996, the popularity has increased by 30.6%. In 2006, approximately 1 in every 2,696 girls born was named Cassie. FALLING Recent data shows the name is currently falling.