Kelby is a distinctive boys' name in United States, ranking #1918 in 2010 with 74 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has decreased by 23.7%. In 2010, approximately 1 in every 25,924 boys born was named Kelby. STABLE Recent data shows the name is currently stable.