Cassidi is a distinctive girls' name in United States, ranking #7601 in 2010 with 16 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has decreased by 56.8%. In 2010, approximately 1 in every 111,083 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.