Helga

Also French, Italian, Romanian, Spanish, Slovak, Latvian and Lithuanian.

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

Also Portuguese: [noted -ed]

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-https://pt.m.wiktionary.org/wiki/Helga
-https://en.m.wiktionary.org/wiki/Helga#Portuguese
-https://www.behindthename.com/name/helga/top/brazil

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Also Polish:

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-https://pl.m.wikipedia.org/wiki/Helga
-https://pl.m.wiktionary.org/wiki/Helga
-https://en.m.wiktionary.org/wiki/Helga#Polish

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Also Estonian:

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-https://www.stat.ee/nimed/Helga
-https://et.m.wikipedia.org/wiki/Helga
-https://en.m.wiktionary.org/wiki/Helga#Estonian

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Also Czech:

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-https://cs.m.wikipedia.org/wiki/Helga
-https://www.behindthename.com/name/helga/top/czech

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Also Slovak: https://en.m.wiktionary.org/wiki/Helga#Slovak

As of January 2021, there have been 1564 women in Poland named Helga.

Also used in Albanian: https://instatemra.shinyapps.io/emra/
https://sq.wikipedia.org/wiki/Helga_Sallaku

Also Flemish: http://www.names.be/meisjesnamen.html?met=Helga&sort=beldesc

Although the standard Polish form of this name is Olga, there are also some Helgas in Poland (possibly they're all from the German minority, I don't know, but it is very strongly associated with Germany to the point where a lot of Polish people think the stereotypical German couple is called Helga and Helmut). This name was not given to any children in 2020 as either the first or middle name, however there are 2314 women with this first name in Poland, and 615 have it as their middle name. From what I know there's no specifically Helga name day, but she could celebrate her name day with Olga. I get the impression that this name is not very liked by people these days and people think it's cringey and very old-fashioned and harsh-sounding. Nicknames may include Helgusia, Helgunia, Hela, Helka, Helusia, Helunia, Helinka, Heli, Eli, Elka etc...

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

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

Also Polish: https://pl.wikipedia.org/wiki/Helga
https://pl.wiktionary.org/wiki/Helga

Also Galician (albeit rare): 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

Also Slovak: https://en.wiktionary.org/wiki/Helga -- offer sources
You'll find numerous bearers on social media.

The name is also rather common in Iceland. [noted -ed]

It is also a Hungarian name. Pronunced: HEL-gaw. [noted -ed]