Ernestina

Also used in Brazil: https://www.ibge.gov.br/censo2010/apps/nomes/#/search/response/16

Also Portuguese:

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https://www.behindthename.com/name/ernestina/top/brazil
https://pt.m.wiktionary.org/wiki/Ernestina
https://forebears.io/forenames/ernestina [noted -ed]

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://nossaistorgia.ch/entries/zmkMAA12MrN

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

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

Also Banatswabian: https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I34918&nachname=Fischhof&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I34606&nachname=Lassloffy&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=werschetz&ID=I95040&nachname=Beck&modus=&lang=de

Also Slovene: https://sl.wikipedia.org/wiki/Ernestina

Also (albeit rarely) used in Romania. You'll find bearers on social media.

Also Spanish: https://www.ine.es/tnombres/formGeneralresult.do?vista=3

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#D

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