Keilyn is a distinctive boys' name in United States, ranking #9177 in 2015 with 8 recorded births. The name reached its all-time peak in 2011 with 20 births ranking #4751. Since 1996, the popularity has increased by 33.3%. In 2015, approximately 1 in every 239,532 boys born was named Keilyn. FALLING Recent data shows the name is currently falling.