Kelby is a distinctive boys' name in United States, ranking #1703 in 2005 with 79 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 18.6%. In 2005, approximately 1 in every 25,280 boys born was named Kelby. STABLE Recent data shows the name is currently stable.