Koji is a distinctive boys' name in United States, ranking #7218 in 2006 with 11 recorded births. The name reached its all-time peak in 2025 with 34 births ranking #3412. Since 1996, the popularity has increased by 57.1%. In 2006, approximately 1 in every 186,829 boys born was named Koji. STABLE Recent data shows the name is currently stable.