Kaydyn is a distinctive girls' name in United States, ranking #6040 in 2011 with 22 recorded births. This places Kaydyn in the top 31% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2009 with 24 births ranking #5796. In 2011, approximately 1 in every 79,946 girls born was named Kaydyn. FALLING Recent data shows the name is currently falling.