Tereza

Also Russian: https://ru.wiktionary.org/wiki/%D0%A2%D0%B5%D1%80%D0%B5%D0%B7%D0%B0

Also Albanian. You'll find numerous bearers on social media.

Also Croatian: https://actacroatica.com/en/name/Tereza/
https://en.wiktionary.org/wiki/Tereza#Serbo-Croatian
https://hr.wikipedia.org/wiki/Tereza_Kesovija
https://hr.wikipedia.org/wiki/Tereza_Mrde%C5%BEa
https://hr.wikipedia.org/wiki/Tereza_Ganza-Aras [noted -ed]

Allegedly also used in Hungary: https://hu.wikipedia.org/wiki/Ter%C3%A9zia -- mention Tereza as a variant

Also Slovene: https://sl.wikipedia.org/wiki/Tereza

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

Also Slovak: https://sk.wikipedia.org/wiki/Meniny_na_Slovensku --- name day: October 15
You'll find numerous bearers on social media.

Also Sorbian: https://hsb.wiktionary.org/wiki/Tereza.

It is used also in Albania.

Tereza is also the Georgian form of Theresa, although the name is currently rare in Georgia.

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In Georgian, Tereza is written as: ტერეზა.

This is a feminine name in Croatia, as well as a short form of Terezija, a much rarer variant.