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Hmm.... Well this thing is called Yveltal, I see the Old English "evil" in it, what about -tal? Quetzal? Talon? No that doesn't do at all, it doesn't fit quite right.
I'd rather its name came from French 'noir' meaning black, and something referring to its general wyvern shape. So... Yes I think something like 'Noivern' would be a good name for this Pokémon.