Cassey is a distinctive girls' name in United States, ranking #2943 in 1999 with 45 recorded births. The name reached its all-time peak in 1998 with 48 births ranking #2764. Since 1996, the popularity has increased by 21.6%. In 1999, approximately 1 in every 39,417 girls born was named Cassey. FALLING Recent data shows the name is currently falling.