Cassie is a moderately popular girls' name in England & Wales, ranking #459 in 1998 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 1998, approximately 1 in every 4,518 girls born was named Cassie. FALLING Recent data shows the name is currently falling.