Cassidi is a distinctive girls' name in United States, ranking #10595 in 2012 with 10 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has decreased by 73.0%. In 2012, approximately 1 in every 176,074 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.