Cassie is a distinctive girls' name in England & Wales, ranking #503 in 2003 with 64 recorded births. The name reached its all-time peak in 2008 with 133 births ranking #336. Since 1996, the popularity has decreased by 24.7%. In 2003, approximately 1 in every 4,354 girls born was named Cassie. FALLING Recent data shows the name is currently falling.