Joker having a name?

I often wonder would it be so bad to find out Joker's old name? I mean knowing him he probably destroyed his records so thoroughly find just his name would be a fine example of why Batman's the World's Greatest Detective. Personally if I had to guess the first name Jack is the best contender for Joker. Not to mention it's common enough to prevent us from learning much about his past. In fact it was even used in Earth 3 for his heroic counterpart Jokester. Ztyran 23:11, December 30, 2010 (UTC)