I guess I'm a great believer in the original intention of the author being important, and thus am apt to be overly annoyed at these kinds of things, so I guess

I guess I'm a great believer in the original intention of the author being important, and thus am apt to be overly annoyed at these kinds of things, so I guess you might make that assumption from just the text, however the common tropes in genre do not do this kind of thing, in Science Fiction many people can have non English names and those are generally provided, and in fact in the book there are numerous names that are not English or any recognizable language, so all that together makes it seem like we are doing way too much work to explain away a messy narrative decision - if there is an Occam's razor for fiction, which I shall suppose there is having conceived of it, it seems much more reasonable to suppose Paul is named Paul Atreides, and Duncan Idaho is named Duncan Idaho.