Cassidi is a distinctive girls' name in United States, ranking #3156 in 2002 with 45 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has increased by 21.6%. In 2002, approximately 1 in every 39,929 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.