Cassy is a distinctive girls' name in United States, ranking #9411 in 2006 with 12 recorded births. The name reached its all-time peak in 1998 with 50 births ranking #2700. Since 1996, the popularity has decreased by 70.7%. In 2006, approximately 1 in every 158,423 girls born was named Cassy. FALLING Recent data shows the name is currently falling.