Sebastain is a distinctive boys' name in United States, ranking #4436 in 2001 with 18 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 200.0%. In 2001, approximately 1 in every 107,935 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.