Medieval French diminutive of Servais (as -et is a French masculine diminutive suffix). This given name fell out of use in France after the Middle Ages, but it has since enjoyed an extremely modest revival in the late 1980s. Despite that, the name is still extremely rare in France nowadays, to the point that it is much more common as a patronymic surname instead (and that while the surname itself is rare as well!).
indicate the level to which a name has been verified.