Forum:Moon and Sun?

I don't understand. In the 4th Wands and Worlds chat Vicky said this.

Mistysky(Q) ***was Bluestar the frist name you came up with for Bluestar?

VickyHolmes(A): No, actually! She started out as "Moonstar", in the earliest drafts of the storyline, but then I decided that no cats would have "moon" in their names because it should be reserved for the Clans' special spiritual places. So she became Bluestar instead!

I believe she said something like this about 'Sun' as well. Why would she say this when in one book there is a Sunpaw and Bluestar's mother is Moonflower? This makes no sense.