Modern blend of Faye (fairy, from Old French fae) and Dell (valley).
Faydell is a modern blend of Faye and Dell, drawing together a fairy-like Old French element and a word associated with a valley. That combination gives the name a gentle naturalism, with one half airy and magical, the other grounded and pastoral.
It is the sort of name that feels composed from images rather than inherited from a single historical source. As a contemporary creation, Faydell sounds soft but not flimsy. The structure makes it seem polished, while the blended origins give it a faintly romantic, storybook atmosphere.
It feels like a name meant to suggest charm, landscape, and lightness all at once. Faydell is unusual without being harsh, which is often the appeal of modern invented names that borrow from nature and older feminine forms.