Cassy is a distinctive girls' name in United States, ranking #4522 in 2002 with 27 recorded births. The name reached its all-time peak in 1998 with 50 births ranking #2700. Since 1996, the popularity has decreased by 34.1%. In 2002, approximately 1 in every 66,549 girls born was named Cassy. FALLING Recent data shows the name is currently falling.