I suppose the Irish forces would have qualified in WW2, but as they were neutral not much chance of any VCs being handed out. Irishmen who served in the British forces, as many did, would be eligible for the VC.
Which European National (apart from the French; we know we own france) qualifies as "commonwealth"?
Europeans, or indeed people of any
nationality can recieve a VC, if they are serving in a Commonwealth military unit (that used to be the case, I doubt it applies to much, if any, of the Commonwealth now)
So a Norwegian in the British navy, even if he remained a Norwegian citizen, could get a VC, but a Norwegian in the Norwegian navy couldn't get a VC.