Kelby is a distinctive boys' name in United States, ranking #1014 in 1998 with 134 recorded births. This places Kelby in the top 9% 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 increased by 38.1%. In 1998, approximately 1 in every 14,264 boys born was named Kelby. STABLE Recent data shows the name is currently stable.