Sébastien is a common French given name. It is a French form of the Latin name Sebastianus meaning "from Sebaste". Sebaste was a common placename in classical Antiquity, derived from the Greek word σεβαστος, or sebastos, meaning "venerable." Notable people named Sébastien or Sebastien include: Military. Sébastien Le Prestre de Vauban (1633-1707), a Marshal of France and the foremost military engineer of his age. Sébastien Pontault de Beaulieu (died 1674), French engineer considered to be the first military topographer. Arts and entertainment.
https://en.wikipedia.org/wiki/S%C3%A9bastien