Cassidi is a distinctive girls' name in United States, ranking #5262 in 2006 with 26 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has decreased by 29.7%. In 2006, approximately 1 in every 73,118 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.