Carolina

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://www.portraitarchiv.ch/portrait?page=90
http://www.annalas.ch/persunas/display/q:Carolina

Actually, common abbreviations in EU Portuguese and Brazilian Portuguese are not "Linna", it's Carol.

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

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

Also Banatswabian: https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I4188&nachname=Wingert%20(Weingart)&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=werschetz&ID=I42874&nachname=B%C3%A4r&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=werschetz&ID=I104055&nachname=Bayer&modus=&lang=de

Also used in Romania: https://ro.wikipedia.org/wiki/Carolina_Ilica

Also Galician: https://gl.wikipedia.org/wiki/Carolina_(antroponimia)

Also Occitan: https://fr.wiktionary.org/wiki/Carolina#Occitan
(Sources: Frédéric Mistral, Lou Tresor dóu Félibrige ou Dictionnaire provençal-français embrassant les divers dialectes de la langue d’oc moderne, 1879
Josiana Ubaud, Diccionari ortografic, gramatical e morfologic de l’occitan segon los parlars lengadocians, Trabucaire, 2011)

More than 99.9 percent of people with the first name Carolina are female.
Also Catalan and Galician.

Carolina is also Romanian, though it's not as common. I know a Romanian Carolina.