Marta

Also Norwegian: https://www.nordicnames.de/wiki/Marta

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/rmyDr26D8RK
https://nossaistorgia.ch/entries/w4LMYxpD2lW
https://www.portraitarchiv.ch/portrait?page=109

Also Albanian: https://instatemra.shinyapps.io/emra/
https://sq.wikipedia.org/wiki/Marta_Burda

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

Marta is also Estonian. The name day for Marta in Estonia is July 27. [noted -ed]

Also Banatswabian: https://ofb.genealogy.net/famreport.php?ofb=zichydorf&ID=I19637&nachname=Schneider&modus=&lang=de
https://ofb.genealogy.net/famreport.php?ofb=werschetz&ID=I91562&nachname=Bed%C3%B6&modus=&lang=de

Also Sardinian: https://docplayer.it/45613861-Antioco-sant-326-antoninu-sant-antonio-abate-sant-driano-sant-antonio-da-padova-sant-agata-sant-sant-ada-adi-agata-lulla-agnese-sant.html

Also Corsican: http://www.corsicami.com/corse%20prenoms/prenoms_corses_m07.htm
https://co.wikipedia.org/wiki/Frassetu
You'll find numerous bearers on social media.

Also Estonian: https://et.wikipedia.org/wiki/Marta_(eesnimi)

Also Kashubian: https://csb.wikipedia.org/wiki/Sw._Marta

Also Galician: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp
https://gl.wikipedia.org/wiki/Marta_(nome)

Also Belarusian: http://www.galerie-atelier-3-barmstedt.de/ausstellungen/wzd/portfolio.pdf -- Marta Shmatava [noted -ed]
https://www.olympic.org/Marta-sachanka
https://bolshoibelarus.by/eng/bolshoi-state-opera-of-belarus.html?view=myart&id=3105:&catid=35 --- Marta Danusevich

Also Ukrainian: https://en.wikipedia.org/wiki/Marta_Kostyuk [noted -ed]
http://ukrainedemocracy.org/?network=Marta-barandiy

Also Gascon: https://fr.wiktionary.org/wiki/Marta#Ancien_occitan (Source: Michel Grosclaude, Dictionnaire étymologique des noms de famille gascons, 2003)

Also Sorbian: https://hsb.wiktionary.org/wiki/P%C5%99idawk:Lis%C4%87ina_hornjoserbskich_p%C5%99edmjenow.

Also Russian. [noted -ed]

The name Marta was given to 53 girls born in the US in 2015.

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

Also German variant spelling of Martha. [noted -ed]

Marta is also the Georgian form of Martha. It is frequently used in the country.

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In Georgian, Marta is written as: მართა. [noted -ed]

Also Croatian. [noted -ed]

Czech and pronounced MAHR-tah as well. [noted -ed]

Also Irish, and pronounced MAR-ta.

Also Serbian. [noted -ed]