Kaithlyn is a distinctive girls' name in United States, ranking #5568 in 2002 with 21 recorded births. The name reached its all-time peak in 2002 with 21 births ranking #5568. Since 1996, the popularity has increased by 320.0%. In 2002, approximately 1 in every 85,563 girls born was named Kaithlyn. FALLING Recent data shows the name is currently falling.