Koi is a distinctive boys' name in United States, ranking #5330 in 2007 with 17 recorded births. The name reached its all-time peak in 2022 with 64 births ranking #2259. Since 1996, the popularity has increased by 112.5%. In 2007, approximately 1 in every 122,073 boys born was named Koi. FALLING Recent data shows the name is currently falling.