I got this as a seedling at a swap 2 years ago, the tag said 'white lily'. It flowered today and it's a beauty.
The flower faces out so it's likely an Oriental but that's as far as I can guess.
If it is a seedling, then it has no name. Sure has a pretty face, though!
Looks like an asiatic ~ they come in every orientation from straight up to side- and down-facing. Fragrant?