Sebastain is a distinctive boys' name in United States, ranking #5223 in 2003 with 15 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 150.0%. In 2003, approximately 1 in every 131,685 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.