Don't quote me, but it could be an accent thing. People from different parts of Sweden say things a little differently, especially those from the far South or the far North. That's what I've noticed from my language CDs, as well.
If you are learning Finland Swedish, then you might be able to ask someone who learned Swedish in school how ss is said there.
(This rather belongs in the Answers section, doesn't it?)
There's nothing special about names there, it's just that "rs" is generally pronounced "(r)sh" (with a rather weak "r") in many regions. Does your book have a pronunciation file for "varsågod" or "vi hörs", for example? You should hear the sound there as well.