I know quite a few (at least 2 personally, and 1 set does the voice of George Pig on Peppa Pig :o!) Oliver and Alices, 2 Hugo and Isaacs, and knew a couple of David and Alistairs at school.
I'm now starting to worry that DH and I have chosen a new 'sibling set' of names for our DC, as today we overheard DS's name and DC2's name together a LOT. DC2 is due next month, and we can still change the name we've chosen, obviously, but I just wondered what names you hear together a lot?