Giscard himself is of the minor nobility, although I can’t remember if he is Capetian/Bourbon in his lineage.
Merovingian? And thereby a descendant of Christ, according to Dan Brown.
Giscard is not from a noble family. Giscard d’Estaing in NOT his family’s true name. His pretentions of aristocratic origins made him the laughing stock of the real nobility, and the average bourgeouisie as well. His father or grandfather purchased the particule (d’) when he purchased the estate of a noble family.