Kaithlyn is a distinctive girls' name in United States, ranking #7899 in 2007 with 16 recorded births. The name reached its all-time peak in 2002 with 21 births ranking #5568. Since 1996, the popularity has increased by 220.0%. In 2007, approximately 1 in every 120,153 girls born was named Kaithlyn. FALLING Recent data shows the name is currently falling.