Koji is a distinctive boys' name in United States, ranking #5331 in 2007 with 17 recorded births. The name reached its all-time peak in 2025 with 34 births ranking #3412. Since 1996, the popularity has increased by 142.9%. In 2007, approximately 1 in every 122,073 boys born was named Koji. STABLE Recent data shows the name is currently stable.