Greta

Also Norwegian and Finnish: https://www.nordicnames.de/wiki/Greta

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

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

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://www.portraitarchiv.ch/portrait?page=277

Also used in Albanian: https://instatemra.shinyapps.io/emra/
https://sq.wikipedia.org/wiki/Greta_Ko%C3%A7i
https://sq.wikipedia.org/wiki/Greta_Shllaku

Also Judeo-Anglo-Norman.
Source: Seror, Simon "Les noms des femmes juives en Angleterre au Moyen Âge".

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

Also Estonian: https://et.wikipedia.org/wiki/Greta

Also Polish: https://pl.wikipedia.org/wiki/Greta
https://pl.wiktionary.org/wiki/Greta [noted -ed]

Common in Lithuania. [noted -ed]

Also a feminine name in Croatia.