Cailyn is a distinctive girls' name in United States, ranking #974 in 2007 with 276 recorded births. This places Cailyn in the top 5% of ranked US girls' names for the year. Its actual usage is classified as Uncommon. The name reached its all-time peak in 2009 with 401 births ranking #723. Since 1996, the popularity has increased by 193.6%. In 2007, approximately 1 in every 6,965 girls born was named Cailyn. FALLING Recent data shows the name is currently falling.