Royal expert Eve Pollard has told ITV News the new princess will be "the youngest fashion icon in the world" from the moment she leaves the hospital.
Asked about potential baby names, she said, "Diana or maybe Francis ... I think one of those will probably pop up".
The Takasakiyama Natural Zoological Garden in Oita is now considering renaming Charlotte after complaints from the Japanese public.
Kensington Palace warning over 'harassment' around Sandringham where Kate and William are staying with princess Charlotte and prince George.
Naming the royal baby Charlotte Elizabeth Diana will be seen as a tribute to the Duke of Cambridge's father, mother and grandfather.