Keilyn is a distinctive girls' name in United States, ranking #8874 in 2000 with 11 recorded births. The name reached its all-time peak in 2009 with 63 births ranking #2813. Since 1996, the popularity has increased by 22.2%. In 2000, approximately 1 in every 165,088 girls born was named Keilyn. FALLING Recent data shows the name is currently falling.