Kolby is a distinctive boys' name in United States, ranking #675 in 1996 with 244 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. In 1996, approximately 1 in every 7,763 boys born was named Kolby. STABLE Recent data shows the name is currently stable.