I have named a couple of my machines but not my Janome 6600. I have to get busy on that.
I have a Singer 66 treadle that I named "Smitty" after my mother-in-law. Her husband used to call her that because her maiden name was Smith. My husband told me she used to sit at her sewing machine and sew for his brothers and sisters. All 6 total.
I also have a Featherweight which I call "Priscilla" because the machine is so Prissy looking. I love it!
Good luck in finding a name for your precious machine.