Sebastain is a distinctive boys' name in United States, ranking #7165 in 1997 with 8 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 33.3%. In 1997, approximately 1 in every 235,636 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.