Cassidi is a distinctive girls' name in United States, ranking #3586 in 1998 with 33 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has decreased by 10.8%. In 1998, approximately 1 in every 53,542 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.