Kolby is a distinctive girls' name in United States, ranking #7691 in 2006 with 16 recorded births. The name reached its all-time peak in 2000 with 55 births ranking #2690. Since 1996, the popularity has decreased by 60.0%. In 2006, approximately 1 in every 118,817 girls born was named Kolby. STABLE Recent data shows the name is currently stable.