Why Dave?
Don't disagree with Archimedes about the use of a normal name for the ac, but I assumed selection of the name Dave (as opposed to Phil, Algenon or some such) was something to do with a certain character by the name of Trigger (Only Fools and Horses), and his insistance on always calling Rodney 'Dave'.
Personally I am absolutely hopeless at remembering names, which was a particular problem a few years ago when coaching soccer to small children (aged 5-8). I got round it by explaining that if I couldn't remember someone's name, I would call them 'Dave', but that I expected them to shout back their proper names when I did so. Worked well, and meant the parents didn't get upset.
Sorry, just drifted off there ... happy days. I'll get me coat.
STH