It was probably just a fly a guide tied up one night and then it worked. It reminds me of a black bear or black skunk pattern variation but who knows.

I think that a lot of people get caught up in names and formulas for flies. There are usually more than one name for a fly regionaly and as many stories for the creation of said fly. If it works for you thats all that matters. But you could probably look up hair wing salmon flies and find a name for something that looks very close to what they are using. Good luck, and have fun.