Hi there. It's dawned on me that the Scandinavian pronunciation of Magnus is close to or identical with the original Latin ... no doubt that is a coincidence, but a nice one.
Magnus is also used as a name in Scotland, though - right? No doubt as a result of a few left-over Vikings. Do they use the version, or the more Anglo ? Bearing in mind the truth abouty Dalziel and Menzies, they are clearly capable of doing interesting things to an innocent alphabet ... and writing system!
And then there's Agnes ... always now with the spelling pronunciation in English, I imagine, though there was also a time when the French version was widespread. (I trust that Angus always ends in Gus! would not sound polite.)