Kelby is a distinctive boys' name in United States, ranking #2831 in 2015 with 42 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 56.7%. In 2015, approximately 1 in every 45,625 boys born was named Kelby. STABLE Recent data shows the name is currently stable.