Well, I also call my Bernina 1630 "Bernie" just a different spelling. My 221 Featherweight is "Feather". I have an old treadle, which is just "treadle".. my Singer Touch & Sew 750 is "faithful", it never fails me, and my Singer 285K is "scottie" because it was made in Scotland.
Not very original but it works for me. Maybe I need another machine to name something really unique.. LOL
Jacke