After rejecting the rather too-staid-for-celebs names Helen and Lisa, Katie and husband Kieran Hayler gave serious consideration to...Lady, Disney, Bambi, Ethel, Peggy, Duchess Kate or plain old Duchess. But nothing connected with the couple in quite the same way as Bunny which, according to our baby name generator, 'is a common name used for pet rabbits, and also has ties to the infamous Playboy Bunnies'.
As she posed on the cover of OK! with Bunny, Katie told the magazine: "I considered spelling it 'Bunni' with a heart above the 'I', but I don't think that's really part of the English language."
You can see the couple's logic for the unusual name, of course.
As Katie explains: "Because we have Princess we couldn't call this baby something like Helen or Lisa."
Not to mention Kieran and Katie's son Jett Riviera, and Katie's son (by Peter Andre) Junior Savva Andreas, oh and (by Dwight Yorke) the rather mundane (by comparison) Harvey.
In fact, amongst her siblings, Bunny doesn't sound funny at all.