Koji is a distinctive boys' name in United States, ranking #6736 in 2001 with 10 recorded births. The name reached its all-time peak in 2025 with 34 births ranking #3412. Since 1996, the popularity has increased by 42.9%. In 2001, approximately 1 in every 194,283 boys born was named Koji. STABLE Recent data shows the name is currently stable.