Cassie is a moderately popular girls' name in England & Wales, ranking #458 in 2010 with 90 recorded births. This places Cassie in the top 6% of ranked UK girls' names for the year. Its actual usage is classified as Moderately Popular. The name reached its all-time peak in 2008 with 133 births ranking #336. In 2010, approximately 1 in every 3,567 girls born was named Cassie. FALLING Recent data shows the name is currently falling.