I have owned several personal slaves.
As the relationship develops, names are given. One may ask "How do I name them?" Here's an example, a 21 year old male served me and every time I looked at him I saw a boy. His slave name eventually became boy. Funny thing is the other Mistresses started calling him boy even the Mistresses who were close to him in age called him that. I owned another slave that I call shithead. That name was earned because he asked stupid questions and it seemed as if he had shit for brains. My slave rubberslut earned his name because he is obsessed with rubber, it seem as if he sleeps, dreams, and wakes up in rubber. Names are given on some defined or obvious characteristic but more often than not it's from personality or a quirk rather than appearance.
Mistress Ariana Chevalier
Keeping The World Shiny Tight And Well Disciplined!