Kaithlyn is a distinctive girls' name in United States, ranking #8341 in 2013 with 14 recorded births. This places Kaithlyn in the top 43% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2002 with 21 births ranking #5568. Since 1996, the popularity has increased by 180.0%. In 2013, approximately 1 in every 125,315 girls born was named Kaithlyn. FALLING Recent data shows the name is currently falling.