Kolby is a distinctive boys' name in United States, ranking #1263 in 2021 with 151 recorded births. The name reached its all-time peak in 2001 with 739 births ranking #359. Since 1996, the popularity has decreased by 38.1%. In 2021, approximately 1 in every 11,578 boys born was named Kolby. STABLE Recent data shows the name is currently stable.