I think it could be, also. Hard to know for sure, but mine is in a pretty shady spot, so I've taken pictures with a bluer cast like yours has. Here's a pic I took earlier this year that sorta looks similar to yours:
So grateful for this thread - my mother had got one daylily from a seller in FL a long time ago, but she couldn't remember the name. After seeing this and thinking how much it looked like the one very distinct blue/lavender-looking one we had, I asked her and that is the one! Now only another 50+ cultivars to track down names for...