On the “Squid” derivation, my favorite apocryphal origin story is that when sportbikes as a type were first coming out in the 1960s, they were popular with military personnel (as they are now), particularly with sailors stationed in California. Riding training being a lot less available then, there were tons of novices on the streets with fast machines, few skills and a lot of testosterone.
Those with military backgrounds know that “squid” is a derogatory term used usually by the Army to refer to Naval personnel. And in the wild, real squids can travel very fast in a straight line, but have trouble turning (they have to slow way down)…kinda like an unskilled rider. Couple the two, and viola…”I was putting the surf boards on top of the Country Squire, and this damn squid nearly ran right into the car!”