Cassidi is a distinctive girls' name in United States, ranking #7837 in 2013 with 15 recorded births. The name reached its all-time peak in 1999 with 51 births ranking #2704. Since 1996, the popularity has decreased by 59.5%. In 2013, approximately 1 in every 116,961 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.