Kaithlyn is a distinctive girls' name in United States, ranking #9783 in 2015 with 11 recorded births. The name reached its all-time peak in 2002 with 21 births ranking #5568. Since 1996, the popularity has increased by 120.0%. In 2015, approximately 1 in every 162,241 girls born was named Kaithlyn. FALLING Recent data shows the name is currently falling.