Keilyn is a distinctive girls' name in United States, ranking #3745 in 2008 with 43 recorded births. The name reached its all-time peak in 2009 with 63 births ranking #2813. Since 1996, the popularity has increased by 377.8%. In 2008, approximately 1 in every 43,970 girls born was named Keilyn. FALLING Recent data shows the name is currently falling.