Koy is a distinctive boys' name in United States, ranking #3191 in 2006 with 34 recorded births. The name reached its all-time peak in 1997 with 46 births ranking #1982. Since 1996, the popularity has increased by 61.9%. In 2006, approximately 1 in every 60,445 boys born was named Koy. FALLING Recent data shows the name is currently falling.