Miss Mattie Lynn was renamed when she limped out of her kennel the humane society had set up at a rescue point, and into my arms. Her long fur was so dreadlocked and matted up that her hind leg was practically "sewn" to her body. It was shameful. We fixed it.
Jack came from the same rescue efforts, but a day later. He was one of the last to be chosen, and looked really scrawny and plain, and no-one was interested in him. He had no microchip and no collar, so the rescuers were calling him no-chip-no-collar. I had to work late that day, so I was one of the last foster parents to arrive. I figured, he's a foster so no matter that he's a plain Jane. He just needs my help. So I took him home and called him plain ole Jack. It was the simplest thing I could come up with.
Love it now, because Jack and Lil' (Lillian, my weimaraner), are the bestest of buds and it rolls off the tongue, Jack and Lil'...like Jack and Jill.
Both "fosters" stayed with me and are forever mine. Jack is truly my heart dog. He came to me missing half of his ear so I tease him sometimes, and call him my One-Eared Jack o' Hearts!
P.S. When the dogs' seizure was overturned by the courts a few months later, I drove to the kennel and negotiate their purchase. The breeders recognized them instantly and called them by their given names, to which Neither one responded. Mattie just turned right around and jumped back up into my truck. Love my rescues!