Sebastyn is a distinctive boys' name in United States, ranking #8649 in 2011 with 9 recorded births. This places Sebastyn in the bottom 40% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2011 with 9 births ranking #8649. In 2011, approximately 1 in every 210,999 boys born was named Sebastyn. RISING Recent data shows the name is currently rising.