Kelby is a distinctive boys' name in United States, ranking #2972 in 2018 with 40 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 58.8%. In 2018, approximately 1 in every 45,387 boys born was named Kelby. STABLE Recent data shows the name is currently stable.