Keilyn is a distinctive boys' name in United States, ranking #10694 in 2004 with 6 recorded births. This places Keilyn in the bottom 19% 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. In 2004, approximately 1 in every 330,800 boys born was named Keilyn. FALLING Recent data shows the name is currently falling.