Kaithlyn is a distinctive girls' name in United States, ranking #7562 in 2008 with 17 recorded births. The name reached its all-time peak in 2002 with 21 births ranking #5568. Since 1996, the popularity has increased by 240.0%. In 2008, approximately 1 in every 111,219 girls born was named Kaithlyn. FALLING Recent data shows the name is currently falling.