In the 30?s Dan Bailey convinced Lee Wulff to rename the Royal Wulff, and from then a variety of other flies were changed and renamed such as the Ausable Gray, Coffin May and Bucktail Coachman became the Gray Wulff, White Wulff and Royal Wulff. All of these patterns were around pre 1930 and suggested a variety of insects such as beetles, gnats but particularly mayflies. So although not very imitative, at that stage in history they were cutting edge, and have stood the test of time.
The Gray Wullf is a great alternative to an Adams, and because of the wings incorporating deer hair, it floats much better. We’d recommend fishing this fly on a long leader by itself in a mayfly hatch.