Kelby is a distinctive boys' name in United States, ranking #2423 in 2009 with 53 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 45.4%. In 2009, approximately 1 in every 37,421 boys born was named Kelby. STABLE Recent data shows the name is currently stable.