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/Donat_Cadruvi Https://nossaistorgia.ch/entries/KEAVXNqGMNa Https://www.portraitarchiv.ch/portrait?page=222
Donat is also the Croatian, Russian, Serbian and Ukrainian form of Donatus (see Donato).In all but Croatian (as it does not use the Cyrillic alphabet), the name is written as: Донат.
You'll find bearers on social media in both Romania and Moldova.