people called Daz

There seem to be a lot of guys called Daz these days. First there was Daz Sampson on Eurovision, then I heard a guy called Daz phone into Chris Evans, then there was someone called Daz on Deal or No Deal (great show!) . What does it mean? Daz used to be a washing powder! (Do they still make it?) Is it short for Dave, or Derek, or Daniel? Wierd!