Kacy is a distinctive girls' name in United States, ranking #3806 in 2015 with 40 recorded births. The name reached its all-time peak in 1996 with 141 births ranking #1240. Since 1996, the popularity has decreased by 71.6%. In 2015, approximately 1 in every 44,616 girls born was named Kacy. STABLE Recent data shows the name is currently stable.