Koi is a distinctive boys' name in United States, ranking #7148 in 2000 with 9 recorded births. The name reached its all-time peak in 2022 with 64 births ranking #2259. Since 1996, the popularity has increased by 12.5%. In 2000, approximately 1 in every 218,215 boys born was named Koi. FALLING Recent data shows the name is currently falling.