Cassie is a moderately popular girls' name in England & Wales, ranking #349 in 2005 with 114 recorded births. The name reached its all-time peak in 2008 with 133 births ranking #336. Since 1996, the popularity has increased by 34.1%. In 2005, approximately 1 in every 2,529 girls born was named Cassie. FALLING Recent data shows the name is currently falling.