Kaithlyn is a distinctive girls' name in United States, ranking #14230 in 2020 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 2020, approximately 1 in every 269,252 girls born was named Kaithlyn. FALLING Recent data shows the name is currently falling.