In short, yep. There are Jimmy's Parrotheads, The Grateful Dead's Deadheads (no relation to book 1), Gaga's Little Monsters. The list goes on and on. So why do you call your readers Bluebills you might ask.
Well, it all goes back to the North Coast of Washington State in the early 1940s, centering around the small, remote town of Ocean City. Then it was a motley group of people who wanted escape from "civilized society," each for their own reasons. They called themselves Bluebills. Many were folks that spent from spring to fall eeking out a living in Eastern Washington's agriculture as seasonal workers who then would migrate to winter on the coast where they lived off the land, dug razor clams, made shacks out of lumber washed ashore, cut from trees, or cheaply obtained materials. It wasn't an easy life, but it had its charm. Permanent Bluebills toughed it out year-long and the community grew... then shrunk back as the economy of Puget Sound sucked the life out of the litle town, and the focus became Ocean Shores.
Today, Ocean CIty is little more than a bend in the road with a great store to buy beer, bait,and jerkey, but some of the original buildings still stand. The shacks have long been taken by the extreme weather, by fire, or by the fact that they weren't built very well to begin with.
So to honor those of the coastal past, I bestow the title of Bluebill to the readers of Sam and the gang. I hope you wear it with pride and the honor with which it was intended