Koi is a distinctive boys' name in United States, ranking #3061 in 2025 with 40 recorded births. The name reached its all-time peak in 2022 with 64 births ranking #2259. Since 1996, the popularity has increased by 400.0%. In 2025, approximately 1 in every 42,702 boys born was named Koi. FALLING Recent data shows the name is currently falling.