According to this page:
"It was only after the Norman Conquest of 1066 that monarchs took regnal numbers in the French fashion, though the earlier custom of distinguishing monarchs by nicknames did not die out immediately."
Just think, if the Norman's hadn't conquered us maybe we'd be ruled by Queen Elizabeth Craggy-Chops.
In other 'French' news, I heard of Radio 4 yesterday that the credit crunch has hit restaurants hard. Apparently people are getting told to leave if they don't order a starter in order to save money. HA! FUCK YOU, CHEAP BASATARDS!