Kelby is a distinctive boys' name in United States, ranking #1340 in 2004 with 110 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has increased by 13.4%. In 2004, approximately 1 in every 18,044 boys born was named Kelby. STABLE Recent data shows the name is currently stable.