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/
― Anonymous User 2/4/2023
3
Also used in Modern Greece, variant transcription of Ιωνας.
https://www.behindthename.com/name/jonas-2/top/united-states
https://www.behindthename.com/name/jonas-2/top/england-wales