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So, many people might be wondering what "Tuatha Dé Danann" means, and how it's pronounced...
While many people might think that it's "Tuatha de Danann", with the "de" meaning of, I've done a little research, and Tuatha Dé Danann actually means, People of Goddess Danu, but literally translates to People God/Godess Danu.
The Tuatha part means People, Tribe, or Nation, the "Dé" part doesn't actually mean "of" but "God/Godess", and then Danann means Danu. Danu was a Godess of the land, but also the "Mother of Gods" .
As to the pronunciation, you can say Too-Ah-Hah, but with very little emphasis on the "Ah" part, so it's almost like "Too-Hah".
In case you're interested in hearing an actual Audio pronunciation... click the link below. I've found that the third entry, the one by "Conchur" is the best...