Kelby is a distinctive boys' name in United States, ranking #1853 in 2008 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 2008, approximately 1 in every 25,822 boys born was named Kelby. STABLE Recent data shows the name is currently stable.