Kacy is a distinctive girls' name in United States, ranking #3289 in 2011 with 50 recorded births. The name reached its all-time peak in 1996 with 141 births ranking #1240. Since 1996, the popularity has decreased by 64.5%. In 2011, approximately 1 in every 35,176 girls born was named Kacy. STABLE Recent data shows the name is currently stable.