Cassidi is a distinctive girls' name in United States, ranking #5116 in 2003 with 24 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has decreased by 35.1%. In 2003, approximately 1 in every 76,127 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.