Sebastain is a distinctive boys' name in United States, ranking #10414 in 2020 with 7 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 16.7%. In 2020, approximately 1 in every 246,438 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.