I think I read it somewhere in this (or another) forum (years ago, before I was a member). it was the explanation for why the one-tails is called Shukaku and the Kyuubi has no other name - because the author came up with the idea of the tailed beasts later and he needed a name for the funky racoon (they never called it one-tails in the "original" Naruto).
but I'm not 100% sure. after all, it wasn't Kishimoto who told me...