Eva

Also of French usage, alongside Éva and in the case of Eva Green.
https://www.behindthename.com/name/eva/top/france
https://www.behindthename.com/name/e10va
https://en.wikipedia.org/wiki/Eva_Green

Ewe, Euot/Evot, Evota, Evette, Evelot and Evelune are other forms of Eva. Source: https://heraldry.sca.org/names/reaneyAG.html

Also Lithuanian: https://www.behindthename.com/name/eva/top/lithuania

My friend who's Ukrainian has this name, so I'm pretty sure it can be Ukrainian too.

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=251
http://www.annalas.ch/persunas/display/q:Eva

Also Latvian: https://personvardi.pmlp.gov.lv/index.php?name=73014

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

Also Afrikaans: https://af.wikipedia.org/wiki/Eva

You can also use this as a diminutive for Evangeline/Evangelina.

Eva is also Latvian, used alongside Ieva in Latvia. The diminutive form of Eva in Latvian is Evita. The name day for Eva in Latvia is September 12.

Also Cornish: http://members.ozemail.com.au/~kevrenor/cfnames.htm -- "Names for the Cornish" by Christopher Bice - Lodenek Press 1970.
https://kw.wikipedia.org/wiki/Jenesis

Also Armenian, as an alternate transcription of Yeva.

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Scripts: Եվա (Armenian)

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Armenian Pronunciation: yeh-VA.

Also Sardinian: https://sc.wikipedia.org/wiki/Eva_Mameli_Calvino

Eva is also Bosnian. The popularity chart for Bosnia and Herzegovina should be a further indicator of that.

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Bosnian Pronunciation: EH-va.

Also Corsican: http://www.corsicami.com/corse%20prenoms/prenoms_corses_m09.htm
You'll find numerous bearers on social media.

Also Romanian: https://ro.wikipedia.org/wiki/Eva_Cerbu
https://ro.wikipedia.org/wiki/Eva

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And Moldovan: https://ro.wikipedia.org/wiki/Eva_Gudumac [noted -ed]

Also Estonian: https://et.wikipedia.org/wiki/Eva_(eesnimi) [noted -ed]

Also Aragonese: https://an.wikipedia.org/wiki/%C3%81rbol_de_Nadal -- Adán y Eva
http://www.lenguasdearagon.org/pdf/recursoseducativos/unnombretatu.pdf

Also Catalan: http://www.idescat.cat/noms/?q=Eva&lang=en.

Also Latvian: https://www.pmlp.gov.lv/lv/sakums/statistika/personvardu-datu-baze/?id=137&query=Eva.

In 2018, 2 is the most common age for an American (U.S.) Eva who is registered female with the Social Security Administration. It is the 406th most common female first name for living U.S. citizens.

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

Eva was somewhat popular in Norway in the mid-1900s. It ranked at #10 in 1945.

The name Eva is also commonly used in Georgia.

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In Georgian, Eva is written as: ევა. [noted -ed]