Cassidi is a distinctive girls' name in United States, ranking #5632 in 2005 with 22 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has decreased by 40.5%. In 2005, approximately 1 in every 83,986 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.