Justina

Also Czech: https://cs.m.wikipedia.org/wiki/Just%C3%BDna - listed as a variant

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://www.portraitarchiv.ch/portrait?page=138

Also the Portuguese form: https://pt.wikipedia.org/wiki/Justina_(imperatriz)
Used in Brazil: https://www.ibge.gov.br/censo2010/apps/nomes/#/search/response/290
Used in Mozambique: https://pt.wikipedia.org/wiki/Justina_Gaspar [noted -ed]

Also Venetian: https://vec.wikipedia.org/wiki/Santa_Justina

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

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

Also Banatswabian: https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I15958&nachname=Beno&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I10815&nachname=Debert&modus=&lang=de

This name was also fairly common among the German minority in Bessarabia: https://ofb.genealogy.net/famreport.php?ofb=krasna&ID=I5178&nachname=Lauterbach&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=krasna&ID=I9758&nachname=Siebert&modus=&lang=de

Also used in Romania: https://ro.wikipedia.org/wiki/Justina_B%C4%83lu%C8%9Beanu

Also Kashubian: https://csb.wikipedia.org/wiki/13_l%C3%ABpi%C5%84ca
https://csb.wikipedia.org/wiki/28_maja
https://csb.wikipedia.org/wiki/5_s%C3%A9wnika
https://csb.wikipedia.org/wiki/1_z%C3%A9lnika

Add Usage: German, Swedish, Danish, Norwegian, Hungarian, Finnish

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Pronounced: jə-STEE-nə (English), YOO-sti-na (Czech), yuw-STEE-na (German), yuys-TEE-na (Swedish), yoo-STEE-naw (Hungarian), YOO-stee-nah (Finnish)

Russian variant transcription of Yustina.

The name Justina was given to 66 girls born in the US in 2015.

The name Justina was given to 80 baby girls born in the US in 2012.

Also used in Spanish.

Not too common, but it's also used in Croatia.

Justina is also a Czech and Slovak name.
Name Day: 7th October.
Pronounced as "Yoos-tina" (short -oo-).

I am pretty certain this is also a Czech name.