Koji is a distinctive boys' name in United States, ranking #7598 in 1996 with 7 recorded births. This places Koji in the bottom 28% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2025 with 34 births ranking #3412. In 1996, approximately 1 in every 270,605 boys born was named Koji. STABLE Recent data shows the name is currently stable.