Clementina

This name is and has always been used quite frequently in English and Irish gypsy and traveler and Romany community’s.

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://rm.wikipedia.org/wiki/Clementina_Gilly
https://sursassiala.ch/2015/01/15/familienforschung/
https://nossaistorgia.ch/entries/m3zVp9rGD8d
https://www.portraitarchiv.ch/portrait?page=66

This name was also used among the German minority in Bessarabia: https://ofb.genealogy.net/famreport.php?ofb=krasna&ID=I12392&nachname=Loeb&modus=&lang=de

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

This name has been used in Britain and among other English speaking nations since at least the 18th century although rare and the bearer often being aristocratic or well to do. It was always a fairly common name among the English and Irish traveler (gypsy) community too historically.

Also Catalan: http://www.idescat.cat/noms/?q=Clementina&lang=en.

I know a girl called Clementina, and she goes by Clem, which I think is a nice nickname for all Clem- starting names.

Clementina is also the Czech form. Name Day: 23th November.