Kaithlyn is a distinctive girls' name in United States, ranking #12844 in 1997 with 6 recorded births. The name reached its all-time peak in 2002 with 21 births ranking #5568. Since 1996, the popularity has increased by 20.0%. In 1997, approximately 1 in every 290,110 girls born was named Kaithlyn. FALLING Recent data shows the name is currently falling.