Kolby is a distinctive boys' name in United States, ranking #1088 in 2018 with 182 recorded births. The name reached its all-time peak in 2001 with 739 births ranking #359. Since 1996, the popularity has decreased by 25.4%. In 2018, approximately 1 in every 9,975 boys born was named Kolby. STABLE Recent data shows the name is currently stable.