She used the name "Maria Luisa' or "Marie Louise" in French. As a daughter of the Prince of Carignan, she is often "incorrectly" given the surname of Savoy-Carignan. That is incorrect as she was born a princess of the Duchy of Savoy and a daughter of a Prince of Carignan. The title was merely a courtesy title having no legal jurisdiction over Carignan which was known in .