Adelina

Also Polish, as mentioned before:
https://www.behindthename.com/name/adelina/top/poland
https://dane.gov.pl/pl/dataset/1667,lista-imion-wystepujacych-w-rejestrze-pesel-osoby-zyjace/resource/54110/table?page=1&per_page=20&q=Adelina&sort=

Adelina is also English, used alongside Adeline in English.

Last time very popular in Russia.

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://sursassiala.ch/2015/01/15/familienforschung/
https://nossaistorgia.ch/entries/A39DB2bJDNY
https://www.portraitarchiv.ch/portrait?page=66

Also Russian:

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https://ru.m.wikipedia.org/wiki/%D0%90%D0%B4%D0%B5%D0%BB%D0%B8%D0%BD%D0%B0
https://www.behindthename.com/name/adelina/top/russia-moscow

Also Albanian: https://instatemra.shinyapps.io/emra/
https://sq.wikipedia.org/w/index.php?search=Adelina&title=Speciale:K%C3%ABrko&profile=advanced&fulltext=1&ns0=1

Also used in Ukraine.

Also Niçard: http://www.sourgentin.org/cours-de-nissart/les-prenoms/

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

This name was also used among the German minority in Bessarabia: https://ofb.genealogy.net/famreport.php?ofb=krasna&ID=I15537&nachname=Herrmann&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=krasna&ID=I11939&nachname=M%C3%BCller&modus=&lang=de

Also occasionally used in Hungary: https://hu.wikipedia.org/wiki/Adelina

Gender: Feminine

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Usages: Hungarian (Rare)

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Pronunciation: ah-DE-lin-ah

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Meaning: German origins, it means "noble".

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(Information from name #346658 originally submitted by user epresvanilia)

Also Slovene: https://sl.wikipedia.org/wiki/Adela -- mention Adelina
You'll find bearers on social media.

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#I

Also Corsican: http://www.corsicami.com/corse%20prenoms/prenoms_corses_m10.htm
http://geneapiemonte.org/PDF3/Prenoms-italiens.pdf

Also: English, Finnish, Swedish.

Also Polish: https://pl.wikipedia.org/wiki/Adelina_(imi%C4%99)
https://pl.wiktionary.org/wiki/Adelina#pl

Also Albanian.

Also Occitan: https://fr.wikipedia.org/wiki/Liste_des_pr%C3%A9noms_occitans --- Source: Institut d'études occitanes

Also used in Lithuania: https://www.tevu-darzelis.lt/vaiku-vardai/Adelina/

More than 99.9 percent of people with the first name Adelina are female.
Also Latvian, Polish and Romanian.

Used in English-speaking countries.

This was the name of my great aunt, who went by Lina. She was from Bohemia, which is now the Czech Republic if I'm not mistaken.

Also used in Russia.

The named is also used in Bulgaria, spelled Аделина.