This isn't Elvish - it's the Rohirrim, so it would be in their language, though they might have put it into the Common Speech as well.As a listener of Exploring Lord of the Rings I wonder what the elven word was for North-lands and dour-handed. but that is for a different thread and many years in our future.
I'll have to listen again. I thought Halbarad was named in the song and that's where I looked in the book. It's still a question why it never registered before - Halbarad and Aragorn were kin and close friends, so this would affect Aragorn, and you'd think I'd have noticed that among the men of Rohan.So long afterward a maker in Rohan said in his song of the Mounds of Mundburg: