Keilyn is a distinctive girls' name in United States, ranking #6059 in 1999 with 17 recorded births. The name reached its all-time peak in 2009 with 63 births ranking #2813. Since 1996, the popularity has increased by 88.9%. In 1999, approximately 1 in every 104,340 girls born was named Keilyn. FALLING Recent data shows the name is currently falling.