Swedish Phonetics

To Piotr & other experts on Swedish phonetics,
I've recently heard my girlfriend and others pronounce
"nånstans" (somewhere) as "nånstansch" i.e with /-nsh/
and not /-ns/ at the end. The same goes for other words
like "förräns" vulgar av förrän meaning until) pronounced
/förnsh/. I suppose this is an analogy from somewhere but
I can't figure out where. Any ideas on how it arose ? Not
that there has to be a specific reasons for it, just
wondering.

She also claims the english word snob is a contraction
of French sans noblesse from a title tag worn by people
without noblety. Can anyone confirm or deny this ?

thanks in advance,

Harald