Cassy is a distinctive girls' name in United States, ranking #14984 in 2013 with 6 recorded births. The name reached its all-time peak in 1998 with 50 births ranking #2700. Since 1996, the popularity has decreased by 85.4%. In 2013, approximately 1 in every 292,402 girls born was named Cassy. FALLING Recent data shows the name is currently falling.