I was ridiculously spoilest last night by our Sci-fi/Fantasy society deciding to show episode 19 (we've never watched it before so why the hell start with ep 19!!!) and so seriously Del will not say it to his face. He is Scary-scary, Delirium doesn't react well to scary demons even with her abilities (she makes them sing Come on Eileen), so she will not say the name to his face.

She might jokingly, eventually say the Z word to his face. And grin and giggle at him a lot. But she will use Gabriel, as Gabriel is such a pretty name for a dark mind.