Haha! It is dumber than that. >_> There was an episode of Dr Who where the alien people of the week were named things like Poofy W. or Emile Z. or Gojyo S, and we thought that was pretty funny, so we started called the cats their name plus K (yes, for Kitty >_>): Harpo K, Persephone K, etc. Then it morphed into the Ks.