Kelby is a distinctive boys' name in United States, ranking #2490 in 2011 with 50 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 48.5%. In 2011, approximately 1 in every 37,980 boys born was named Kelby. STABLE Recent data shows the name is currently stable.