Casyn is a distinctive boys' name in United States, ranking #5244 in 2025 with 18 recorded births. This places Casyn in the top 38% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2020 with 35 births ranking #3213. In 2025, approximately 1 in every 94,893 boys born was named Casyn. FALLING Recent data shows the name is currently falling.