Sebastain is a distinctive boys' name in United States, ranking #8791 in 2025 with 9 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 50.0%. In 2025, approximately 1 in every 189,786 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.