My family may also be from Orkney...and my father's ydna has been proven to be of a Norwegian branch.
I have been searching for my Moodie-Mudie-Moody family for a long time. I only know for certain back to my 5th grt. grandfather James Moody whose family no doubt came from Scotland and may have come through Northern Ireland with the Ulster-Scots to America.
We have an exact ydna match to a branch of Moody's in Nova Scotia.
At some point way back in time our Moody's (or whatever our name may have been), came from Norway.
It was nice to see the name so close "Moddy" and two people linked between Norway and Orkney on this board.
I wish I could find my missing links back to the 1600's.
Good Luck to you both.