Kelby is a distinctive boys' name in United States, ranking #3725 in 2017 with 29 recorded births. This places Kelby in the top 26% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 70.1%. In 2017, approximately 1 in every 63,804 boys born was named Kelby. STABLE Recent data shows the name is currently stable.