Cailyn is a distinctive girls' name in United States, ranking #1189 in 2002 with 172 recorded births. This places Cailyn in the top 7% 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 401 births ranking #723. Since 1996, the popularity has increased by 83.0%. In 2002, approximately 1 in every 10,447 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.