Kacy is a distinctive boys' name in United States, ranking #3547 in 1998 with 21 recorded births. The name reached its all-time peak in 1996 with 25 births ranking #2977. Since 1996, the popularity has decreased by 16.0%. In 1998, approximately 1 in every 91,015 boys born was named Kacy. FALLING Recent data shows the name is currently falling.