Kelby is a distinctive boys' name in United States, ranking #1237 in 2001 with 108 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has increased by 11.3%. In 2001, approximately 1 in every 17,989 boys born was named Kelby. STABLE Recent data shows the name is currently stable.