For a long time (and I'm talking as far back as Apple II days), I remember IJKL (or IJKM) being the default movement map for lots of games. Lode Runner, for example, used IJKL, and that was in the early 80s.
And when such games offered two-player action, the second player control would be mapped WASD, or WASZ. It wasn't common, but it existed. So the concept of mapping WASD for movement existed waaaaaaaay before Quake. It may well be Quake that popularized it though, but I'm not certain about that part.
Vin Scully, Herge, Ray K. Metzker, Abelardo Morell, Arakawa Hiromu, Mori Kaoru, Steve Jobs, Depeche Mode, Tim Duncan, John Stockton. RESPECT.