Koi is a distinctive boys' name in United States, ranking #2516 in 2021 with 53 recorded births. The name reached its all-time peak in 2022 with 64 births ranking #2259. Since 1996, the popularity has increased by 562.5%. In 2021, approximately 1 in every 32,986 boys born was named Koi. FALLING Recent data shows the name is currently falling.