To be strictly accurate, most of those weren't named by the tyers themselves, but my somebody else. I believe, for example it was Lefty Kreh who renamed the Deep Minnow the "Clouser Minnow". Griffith didn't invent the fly named after him, nor did he name it. He just used it a lot.
Still, your point is valid, and goes back even further. Canon Greenwell may not have suggested "Greenwell's Glory" but he heartily concurred when someone else did. I think that Wickham actually did name his Fancy. Naming flies after people has a long and honorable history.
Remember Dan Cahill.