Tricyrtis (Toad Lily) is at least something I know I've TRIED.
But the leaves don't look the same.
The word "Dianella" isn't familiar and I'm trying to find pics of the foliage.
It MIGHT have come to me under a common name in a trade.
I am absolutely positive that I put no asiatic lilies in that bed - but if a squirrel wanted to carry one all the way from far off, I'd never know that it did until I found it there......
