Kolby is a distinctive boys' name in United States, ranking #1225 in 2025 with 165 recorded births. The name reached its all-time peak in 2001 with 739 births ranking #359. Since 1996, the popularity has decreased by 32.4%. In 2025, approximately 1 in every 10,352 boys born was named Kolby. STABLE Recent data shows the name is currently stable.