Kellyn is a distinctive boys' name in United States, ranking #8394 in 2015 with 9 recorded births. The name reached its all-time peak in 2013 with 19 births ranking #4895. Since 1996, the popularity has increased by 80.0%. In 2015, approximately 1 in every 212,918 boys born was named Kellyn. FALLING Recent data shows the name is currently falling.