This must indeed be the meaning. But I wonder, is there a single Swede with this surname? I think that almost every mention on the internet is a mistake for NORDAHL (there are several hundred, I know) and at least in Sweden NORDHAL is unknown. I can find 273 sites with NORDAHL in the title, and only one with Nordhal (titles are checked a lot more carefully for mistakes of course). The first words on the one Nordhal site: 'Peter Nordahl' :D What do you think?