Martina

Also Portuguese:

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https://www.behindthename.com/name/martina/top/brazil
https://pt.m.wiktionary.org/wiki/Martina
https://forebears.io/forenames/martina

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/A39DB2l8DNY
https://nossaistorgia.ch/entries/w4LMYxpD2lW
https://www.portraitarchiv.ch/portrait?page=69

In Italy Martina is a very common name since the 80s, it's my best friend's name too. The most popular nickname is Marty or Marti.

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

Also Bulgarian: https://bg.wikipedia.org/wiki/%D0%9C%D0%B0%D1%80%D1%82%D0%B8%D0%BD%D0%B0_%D0%A2%D0%B0%D0%B1%D0%B0%D0%BA%D0%BE%D0%B2%D0%B0
You'll find bearers on social media.

Martina is also Bulgarian. The name day for Martina in Bulgaria is March 1.

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Scripts: Мартина (Bulgarian) [noted -ed]

Also Sicilian: https://scn.wikipedia.org/wiki/Noma_siciliani

Also Corsican: http://www.corsicami.com/corse%20prenoms/prenoms_corses_m01.htm

Also Aragonese: https://an.wikipedia.org/wiki/Pelegr%C3%ADn_d%27Anzano --- Martina de Aysa

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

Also used in Bulgaria, Macedonia and Serbia. It is also rare in Russia.

Also used in Hungary. [noted -ed]
Pronounced: MAWR-ti-naw.

The name Martina was given to 130 girls born in the US in 2015.

The name Martina was only given to 99 baby girls born in the US in 2012.

Also Catalan. Martina has been extremely popular in Catalonia for the past few years. [noted -ed]

In Italy Martina is overused since the 1980s. It was the 6th most popular name in Rome in 1986, the 2nd in 1991 (behind Giulia) and the 5th in 1994 (behind Giulia, Francesca, Federica and Chiara); the 2nd most popular in Italy in 2004 (behind Giulia) and the 4th in 2006 (behind Giulia, Sara and Sofia).