Cassidi is a distinctive girls' name in United States, ranking #2955 in 2000 with 48 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has increased by 29.7%. In 2000, approximately 1 in every 37,833 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.