Lord Denning is a now-deceased Law Lord from the UK's House of Lords (Like our Supreme Court) who revolutionized many principles of modern law.
As for why I picked it, well, I'm not named Denning nor am I a Lord. I am not trying to impersonate him. I just have a hard time selecting names/passords and such, and I think I had just been reading about Lord Denning just before. So voila! I don't have a real reason.