And the Welsh is wrong....
I've been told that technically it should be Senedd-dy (Parliament House), not Senedd (Parliament), in any case. Like Owain Glyndwr's.
Dafydd El apparently told the Western Mail that English speakers wouldn't be able to pronounce Senedd-dy:
Lord Elis-Thomas said the term Senedd-dy was rejected as it was too complicated graphically and too difficult for Anglophones to pronounce.