My cat does have a middle name! When she is misbehaving I address her with her full name: Cassie Claire. Her middle name is my late grandmother's first name - she loved to watch Cassie when she would visit me. Cassie has so many "other" names, though (Cat, Cassie Lassie, honeybunny, cookie cat, boo) it's a wonder she even knows her name at all. My sister's RB Siamese cat's middle name was Frank (as in old blue eyes).