Regina

In Jewish communities and the historical Judeo-Anglo-Norman community, Regina was used as a vernacular form of Malka.

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/Y2vV5lpwZe3
https://www.portraitarchiv.ch/portrait?page=169

Also Judeo-Anglo-Norman: http://heraldry.sca.org/names/jewish.html
Seror, Simon "Les noms des femmes juives en Angleterre au Moyen Âge"

I do have a male cousin (distant cousin) in my family tree who was called Regina. He was given the second name of John. I expect he went by Reg or Reggie; when he married his name was given as Reginald.

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

Regina is also Croatian and Slovak. The name days for Regina in Croatia are August 22 and September 7. The name day for Regina in Slovakia is September 5. [noted -ed]

Also Slovene: https://sl.wikipedia.org/wiki/Regina_(ime)

Also Dutch.

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Dutch Pronunciation: reh-GEE-nah.

Also Corsican: http://www.corsicami.com/corse%20prenoms/prenoms_corses_m09.htm

Also Estonian: https://et.wikipedia.org/wiki/Regina_(eesnimi) [noted -ed]

Regina means "queen" in Italian. As a name it's considered really old-fashioned in Italy.

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

In 2018, 46 is the most common age for an American (U.S.) Regina who is registered female with the Social Security Administration. It is the 353rd most common female first name for living U.S. citizens.

The nickname for Regina is Gina or Ginny. The nickname for Reginald is Reggie.

This is also the Croatian form.

Also a feminine name in Slovenia.