Sebastain is a distinctive boys' name in United States, ranking #5700 in 2015 with 16 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 166.7%. In 2015, approximately 1 in every 119,766 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.