Caslynn is a distinctive girls' name in United States, ranking #16358 in 2017 with 5 recorded births. This places Caslynn in the bottom 11% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2017 with 5 births ranking #16358. In 2017, approximately 1 in every 345,176 girls born was named Caslynn. STABLE Recent data shows the name is currently stable.