Koy is a distinctive boys' name in United States, ranking #3496 in 2005 with 28 recorded births. The name reached its all-time peak in 1997 with 46 births ranking #1982. Since 1996, the popularity has increased by 33.3%. In 2005, approximately 1 in every 71,327 boys born was named Koy. FALLING Recent data shows the name is currently falling.