Keilyn is a distinctive boys' name in United States, ranking #8686 in 2009 with 9 recorded births. This places Keilyn in the bottom 40% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2011 with 20 births ranking #4751. Since 1996, the popularity has increased by 50.0%. In 2009, approximately 1 in every 220,367 boys born was named Keilyn. FALLING Recent data shows the name is currently falling.