I'm generally rather dubious about messing with modern songs ("Belfast" Mill, for example, has caused more than its share of confusion!) but if you really don't want to keep the original terms, you could do worse than "Hunter's Moon" and "great Sea Wind" or perhaps "North Sea Wind". We live in small countries over here, and anything more localised might risk sounding parochial as compared to the original, while anything more "celto-specific" would risk sounding out-of-place in the rest of the song.