Kelby is a distinctive boys' name in United States, ranking #1293 in 2003 with 109 recorded births. The name reached its all-time peak in 1998 with 134 births ranking #1014. Since 1996, the popularity has increased by 12.4%. In 2003, approximately 1 in every 18,122 boys born was named Kelby. STABLE Recent data shows the name is currently stable.