Sebastain is a distinctive boys' name in United States, ranking #3890 in 2000 with 21 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 250.0%. In 2000, approximately 1 in every 93,521 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.