In Italy Stefania was overused in the third quarter of the 20th century. It was the 8th most popular name in Rome in 1951, the 5th in 1956 (behind Patrizia, Paola, Daniela and Anna), the 7th in 1961, the 4th in 1966 (behind Alessandra, Paola and Daniela) and the 7th in 1971. Nowadays it is not very popular.
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://nossaistorgia.ch/entries/mwnZwj5pMLg
https://www.portraitarchiv.ch/portrait?page=137