Cecilia

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/mwnZwj5pMLg
Https://www.portraitarchiv.ch/portrait?page=73
Http://www.annalas.ch/persunas/display/q:Cecilia

Also Afrikaans: https://af.wikipedia.org/wiki/Cecilia_(heilige)

Also Languedocian: https://ieo-oc.org/spip.php?page=article&id_article=300 --- Source: Institut d'Estudis Occitans

Cecilia is also Estonian. The name day for Cecilia in Estonia is November 22.

Also Banatswabian: https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I5201&nachname=Frass&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I33232&nachname=Klecker&modus=&lang=de

Also Sicilian: https://scn.wikipedia.org/wiki/Noma_siciliani

Also Estonian: https://et.wikipedia.org/wiki/Cecilia_(eesnimi)

Also Galician: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp
https://gl.wikipedia.org/wiki/Cecilia

In 2018, 2 is the most common age for an American (U.S.) Cecilia who is registered female with the Social Security Administration. It is the 676th most common female first name for living U.S. citizens.

Ceci is a nickname I use for the name Cecilia.

More than 99.9 percent of people with the first name Cecilia are female.
Also Bulgarian, Portuguese and Romanian.

In Icelandic this name is used in the form of Silja.

I'm from Norway and I have never heard of Sissela as a Norwegian name as stated by a user above, but Cecilia is Norwegian too although Cecilie is used more.

Cecilia is also the Czech and Slovak form. Name Day: 22th November.