Cassie is a moderately popular girls' name in England & Wales, ranking #364 in 2009 with 119 recorded births. The name reached its all-time peak in 2008 with 133 births ranking #336. Since 1996, the popularity has increased by 40.0%. In 2009, approximately 1 in every 2,633 girls born was named Cassie. FALLING Recent data shows the name is currently falling.