Lena

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/vxYZeKQ6DA5

Also Amish/Pennsylvania Dutch.

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

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Also Bosnian: https://www.behindthename.com/name/lena/top/bosnia?type=rank

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Also Slovene: https://www.behindthename.com/name/lena/top/slovenia?type=sample

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Also Dutch: https://www.meertens.knaw.nl/nvb/naam/is/Lena

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Also Finnish and Icelandic:

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https://www.nordicnames.de/wiki/Lena
https://www.behindthename.com/name/lena/top/iceland

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Also Armenian, Macedonian, Ukrainian, Bulgarian, Serbian, Latvian, Lithuanian and Estonian:

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https://forebears.io/forenames/lena [noted -ed]

Also used in Spanish. It is used as a diminutive of Elena and Magdalena.

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https://www.conmishijos.com/nombres/lena/
https://www.heraldicafamiliar.com/nombre-lena/
https://www.misabueso.com/nombres/nombre_lena.html

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(in Spanish, they mention Lena as a diminutive of said names).

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It is used as a standalone name in modern times. There are 1.498 bearers of this name in Spain and the average age of the bearers is 14 (source: Instituto Nacional de Estadística).

Lena is also commonly used in the country of Georgia, where it is a short form of Elena, Elene and Madlena. [noted -ed]

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In Georgian, Lena is written as: ლენა.

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Sources used:
- https://web.archive.org/web/20130130184930/http://name.interes.ge/dreams.php?action=view&id=571&from=action=search|by=%E1%83%9A (in Georgian)
- http://www.geogen.ge/ge/wsearch/4314/ (in Georgian; scroll down to the entry for Lena)
- (general): https://www.linkedin.com/pub/dir/?first=Lena&last=&search=Zoeken
• https://ge.linkedin.com/pub/dir/Lena/+/ge-0-Georgi%C3%AB (lists only bearers living in Georgia)
- You can also find plenty of Georgian bearers on Facebook! The best way to find them is to search per city, preferably the most populous ones of Georgia: Tbilisi, Batumi, Kutaisi, Rustavi, Gori and Zugdidi.

Also a Gascon short form of Elena: https://ieo-oc.org/spip.php?page=article&id_article=300 --- Source: Institut d'Estudis Occitans

Lena is also Bulgarian, used as a short form of Elena, Magdalena, Magdalina, as well as other names ending with or otherwise containing Lena. The name day for Lena in Bulgaria is July 22.

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Scripts: Лена (Bulgarian)

12/30/2020 Correction:

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Lena is also Spanish, Bulgarian, and Serbian, used as a short form of Helena, Elena, Yelena, Magdalena, Magdalina, as well as other names ending with or otherwise containing Lena. The name day for Lena in Bulgaria is July 22. Lena is currently a popular name in Serbia.

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Scripts: Лена (Bulgarian), Лена (Serbian)

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Source: https://en.m.wikipedia.org/wiki/Spanish_naming_customs

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

Also Corsican: https://fr.wikibooks.org/wiki/Pr%C3%A9noms_corses
You'll find numerous bearers on social media.

Also Estonian: https://www.stat.ee/public/apps/nimed/

Also Galician: http://www.ige.eu/igebdt/esq.jsp?idioma=gl&ruta=onomast/nomes.jsp
https://gl.wikipedia.org/wiki/Hipocor%C3%ADstico

Also Breton: https://br.wikipedia.org/wiki/Lena
http://www.meilleursprenoms.com/stats/prenoms_stat.php/lena

In 2018, 84 is the most common age for an American (U.S.) Lena who is registered female with the Social Security Administration. It is the 733rd most common female first name for living U.S. citizens.

My name is Valentina and "Lena" (Lay-nuh) is what most people call me as a nickname. The other nickname is "Vale".

It is also popular in Greece (Λένα) - diminutive of Elena (Έλενα) or Elene (Ελενη), Magdalene (Μαγδαληνή), Galene (Γαλήνη), Selene (Σελήνη) or any other names end with "-lene". [noted -ed]

The name is also used in Iceland.

Lena is a common shortname for Helena in Portugal. [noted -ed]

Also used in Croatia.

In Italian Lena is short for Maddalena which is the equivalent of Maddeleine. [noted -ed]

Also a girls name in Slovenia.

Lena was very popular from 1880 to 1910 when its popularity began its decline. It has been in use ever since, just not rating as high on the top 1000 list.