Everyone knows at least one Dave and most know a lot of people called Dave. Readers will know I visited The Woolpack which is owned by a Dave. I visited with my friend Dave, chances are I probably also met a few Dave's while there.
The best thing about having a friend called Dave for me is of course the ability to say in a Hal9000 voice "What are you doing Dave?" Or "Would you like to play a game of chess?".
I have known many Daves in my time, I even watch a TV channel called Dave which shows re runs of shows such as Top Gear.