Sebastain is a distinctive boys' name in United States, ranking #7160 in 2009 with 12 recorded births. The name reached its all-time peak in 2002 with 24 births ranking #3649. Since 1996, the popularity has increased by 100.0%. In 2009, approximately 1 in every 165,275 boys born was named Sebastain. STABLE Recent data shows the name is currently stable.