Kolby is a distinctive boys' name in United States, ranking #791 in 2012 with 286 recorded births. This places Kolby in the top 6% of ranked US boys' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2001 with 739 births ranking #359. Since 1996, the popularity has increased by 17.2%. In 2012, approximately 1 in every 6,632 boys born was named Kolby. STABLE Recent data shows the name is currently stable.