Kelby is a distinctive boys' name in United States, ranking #1885 in 2006 with 72 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 25.8%. In 2006, approximately 1 in every 28,543 boys born was named Kelby. STABLE Recent data shows the name is currently stable.