Kaitlyn is a highly popular girls' name in United States, ranking #33 in 1999 with 8,157 recorded births. The name reached its all-time peak in 2000 with 8,759 births ranking #30. Since 1996, the popularity has increased by 12.7%. In 1999, approximately 1 in every 217 girls born was named Kaitlyn. FALLING Recent data shows the name is currently falling.