Kelby is a distinctive boys' name in United States, ranking #5056 in 2019 with 19 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 80.4%. In 2019, approximately 1 in every 94,387 boys born was named Kelby. STABLE Recent data shows the name is currently stable.