Kolby is a distinctive boys' name in United States, ranking #669 in 2006 with 341 recorded births. The name reached its all-time peak in 2001 with 739 births ranking #359. Since 1996, the popularity has increased by 39.8%. In 2006, approximately 1 in every 6,027 boys born was named Kolby. STABLE Recent data shows the name is currently stable.