Kaithlyn is a distinctive girls' name in United States, ranking #8046 in 2006 with 15 recorded births. The name reached its all-time peak in 2002 with 21 births ranking #5568. Since 1996, the popularity has increased by 200.0%. In 2006, approximately 1 in every 126,738 girls born was named Kaithlyn. FALLING Recent data shows the name is currently falling.