Cornelia

Last year (2023), 6 baby girls in Poland were given the name Cornelia. As of January 2024, 319 women in Poland bear the name Cornelia as a first name. 105 others have it as their middle.

Also Romansh:
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://sursassiala.ch/2015/01/15/familienforschung/
https://nossaistorgia.ch/entries/2WQD92z6M6a
https://nossaistorgia.ch/entries/9YrZRQy2MRE
https://www.portraitarchiv.ch/portrait?page=100

Also Swedish and Norwegian: https://www.nordicnames.de/wiki/Cornelia

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Also used in Spanish: https://www.ine.es/widgets/nombApell/index.shtml?L=1

Also Flemish: http://www.names.be/meisjesnamen.html?met=Cornelia&sort=beldesc

Also Afrikaans: https://af.wikipedia.org/wiki/Cornelia_Swart
You'll find numerous bearers on social media.

Coco, Cici and Cece could also be nicknames.

Apparently also occasionally used in Galician: https://gl.wikipedia.org/wiki/Lista_de_nomes_femininos_en_galego#I
http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp

In Poland, the usual form of the name is Kornelia, but there are 211 women named Cornelia in the whole Polish population. Last year (2018), 6 girls were given the name Cornelia and the name was #378 in the ranking, as opposed to 2413 Kornelias and the name Kornelia being #26.

In 2018, 67 is the most common age for an American (U.S.) Cornelia who is registered female with the Social Security Administration. It is the 1, 943rd most common female first name for living U.S. citizens.

The name Cornelia was given to 28 girls born in the US in 2015.