I just googled: Nordic Rh-
And the results turned up a claim that Rh- if from Scan-DAN-avia Ok, that's not how it's spelt, but maybe it is still the reason that's how it sounds.
Scandinavia is basically Nordic, and maybe according to some claim the origin of Rh-, though so might be the Basque people who have a lot, well, likely the same people at some point.
So, yeah, interesting connections!