Cassy is a distinctive girls' name in United States, ranking #14499 in 2017 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 2017, approximately 1 in every 287,646 girls born was named Cassy. FALLING Recent data shows the name is currently falling.