Cassy is a distinctive girls' name in United States, ranking #7279 in 2003 with 15 recorded births. The name reached its all-time peak in 1998 with 50 births ranking #2700. Since 1996, the popularity has decreased by 63.4%. In 2003, approximately 1 in every 121,803 girls born was named Cassy. FALLING Recent data shows the name is currently falling.