Cassidi is a distinctive girls' name in United States, ranking #2984 in 1997 with 40 recorded births. This places Cassidi in the top 18% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1999 with 51 births ranking #2704. In 1997, approximately 1 in every 43,516 girls born was named Cassidi. FALLING Recent data shows the name is currently falling.