Cassy is a distinctive girls' name in United States, ranking #7804 in 2007 with 16 recorded births. The name reached its all-time peak in 1998 with 50 births ranking #2700. Since 1996, the popularity has decreased by 61.0%. In 2007, approximately 1 in every 120,153 girls born was named Cassy. FALLING Recent data shows the name is currently falling.