My cocker spaniel was "<kennel name> The Doctor Is In" - call name Lucy. She was named after Lucy Van Pelt, but I called her Lucy Brown because in my mind, when they grew up, Lucy married Charlie Brown. Sadly, I had to say good bye to her in 2020, but she was over 16 years old and she lived a long and wonderful life.
My current dog is a Pembroke Welsh Corgi with a registered name of "<Kennel Name> Peppermint Icing". All of the dogs in her litter were named after bakery/pastry items. There is Gateau, Piped with Royal Icing, Creme Brulee, Icing on the Cake, etc. The full name we gave her is Violet Juniper Brown. Violet after Violet Grey (yes, another Peanuts character), Juniper because she was born in June, and Brown in homage to Lucy Brown. Her nicknames are Floof, Foofy, Fluff Butt. She is a fluffy coated corgi so it fits. When she won't stop barking or decides halfway on a walk to just stop walking and sit down, her nickname is ***. LOL
And no, I don't use my pet names in any password...