Descendants of the first Duc de Polignac bear the title of Comte de Polignac. Comte Pierre de Polignac, a great-great-grandson of the first duke, was the father of Rainier III, Prince of Monaco.
The third Duc de Polignac was created a Prince of the Papal States in 1820. The title passed to his male-line descendants as Prince(s) de Polignac. The current head of the ducal and princely branch is Charles-Armand, 8th Duc de Polignac and 6th Prince et Vicomte de Polignac, born in 1946. Other members of this branch are titled Prince or Princess [first name] de Polignac.
The head of another comital branch of the family is the Marquis de Polignac.