I like this name pretty much, wonder why it's so underused. I've never actually met anyone called Hermina. When I was a child, though, I named one of my Barbie princess dolls Hermina... She mostly went by Hermi lol. I still think it's such an elegant sounding and sweet name.
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=120