Teodor

Also Estonian:

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https://en.m.wiktionary.org/wiki/Teodor#Estonian
https://www.stat.ee/nimed/Teodor

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Also Hungarian:

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https://www.behindthename.com/name/teodor/top/hungary
https://hu.m.wikipedia.org/wiki/Tivadar_(keresztn%C3%A9v) - listed as a variant

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://rm.wikipedia.org/wiki/Teodor_Rupp
https://sursassiala.ch/2015/01/15/familienforschung/
https://nossaistorgia.ch/entries/orxDmeQ4D19
https://www.portraitarchiv.ch/portrait?page=66

Apparently also used in Catalan: http://www.idescat.cat/noms/?q=teodor

Also Gascon: https://ieo-oc.org/spip.php?page=article&id_article=290 --- Source: Institut d'Estudis Occitans

Also Estonian: https://et.wikipedia.org/wiki/Teodor

Usage: Swedish, Norwegian, Danish, Romanian, Bulgarian, Slovak, Czech, Polish, Serbian, Croatian, Slovene, Macedonian, German, Finnish, Estonian

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Pronounced: TEH-uw-daw (Swedish), teh-O-dor (Romanian), TEH-aw-dawr (Slovak), TEH-o-dor (Czech, Croatian, Finnish), teh-AW-tawr (Polish), TEH-o-to (German)

Also German.

The German form of the name is Theodor (spelt with initial Th, but pronounced with initial /t/)

In Poland it has been used since XIIIth century and its archaic Polish forms were: Tader, Chodor, Todor, Cader /Czader, Ceder/Czeder. The Russian form (Fyodor) is spelled Fiodor in Poland.