As far as I know, Pirmin is not (only) a Romansh name but rather a very old and quite rare
German name as well:
http://de.wikipedia.org/wiki/Pirmin
Some time last year, I did some research on Romansh names myself and I found
Geronas, Gironnas, Jaronas listed as Romansh forms of
Hieronymus /
Jerome
Duri, Durs and Durisch were listed as Romansh (short) forms of
Dorian /
Doriano