As the pup won't have a registered name yet, you can choose your own name for it, something suitably formal, or leave that to the breeder. Almost none of the KC registered dogs get called by their registered name at home; imagine yelling, say, "Come here, Heliodor Harold Hardrada at Bancroft!" at it. You would settle, in that instance for "Harry", but it's nice to have some formal input. The KC don't allow just any name, because they want to avoid possible confusion, but there's a very nice woman there who will tell you which of your choices is allowed.