I've got a Mr Shitta (serious). I don't know which country he's from though but it's definitely not the UK. He's a nice bloke and a very good customer.
Also, a Walter Wally. His neighbour told me he used to be a park keeper and the kids used to take the mickey something terrible.
Another neighbour told me his middle name, which he keeps quiet about, is William, which when you put it all together comes out as Wally Willy Wally. His parents must have hated him from birth.
I used to have a customer who was a John Thomas and another who I knew as Alan Gunn but one day when I called his sister answered the door and I asked for Alan and she was puzzled and then said do you mean my brother, his names 'Attila'.