Erna 1

Also Croatian: https://actacroatica.com/en/name/Erna/

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Also Latvian: https://personvardi.pmlp.gov.lv/index.php?name=21615

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Also English: https://www.behindthename.com/name/erna-1/top/united-states

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Also French: https://meilleursprenoms.com/popularite-prenom/Erna

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Also Czech:

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https://cs.m.wiktionary.org/wiki/Erna
https://www.behindthename.com/name/erna-1/top/czech

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/Y2vV5vjkDe3
https://nossaistorgia.ch/entries/36oVjP5lMPy
https://www.portraitarchiv.ch/portrait?page=113

Also Slovene: https://sl.wikipedia.org/wiki/Erna [noted -ed]

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

Also Polish: https://pl.wikipedia.org/wiki/Erna

Also Latvian: https://www.pmlp.gov.lv/lv/sakums/statistika/personvardu-datu-baze/?id=137&query=Erna.

Also Hungarian: https://hu.wikipedia.org/wiki/Erna.

Also used in Latvian, French and Lithuanian.

The name is also used in Iceland.

Also used in Finland.

The name is also rather common in Iceland, Denmark, Sweden, and Norway. [noted -ed]

Also used in Sweden, but not common.

Has also been used on girls in Slovenia.