Sebastain is a distinctive boys' name in United States, ranking #6642 in 2010 with 13 recorded births. This places Sebastain in the top 47% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 116.7%. In 2010, approximately 1 in every 147,570 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.