Sebastain is a distinctive boys' name in United States, ranking #4164 in 2005 with 22 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 266.7%. In 2005, approximately 1 in every 90,779 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.