I didn't know about the sewing machine name tradition when I bought my first "big" machine (my Janome 6600), and since my first & last name together sound a lot like a Star Wars character, my dealer named my 6600 "Princess Leia" for me. I thought that was pretty darn funny so I've let the name stick, and it sort of works out. I'm not really a "princessy" type but she's a pretty rugged princess. When I bought my travel machine from the same dealer I was prepared, that one is now "Chewbacca", just because he was always my favorite character. So apparently Janome machines in my household now get Star Wars names.
My original 90's Kenmore that was my first ever sewing machine that I bought myself as a teen, that one is a "he" for some reason and gets called "Old Squeaky". He's actually been oiled up since then and the squeak is gone, but the name has stuck. It's amazing that machine still works at all, considering it's probably all plastic inside and I abused that machine terribly, sewing all sorts of weird stuff (I've sewn cardboard on that thing) and never doing any oiling or maintenance until just recently - I barely even changed the needle. It's a little "tired" but still works! It's my 2nd string backup now.
My brother embroidery machine is just called "Big Brother" - when I got it my travel machine was a smaller Brother machine (called "Little Brother") but I've given that one away since then.
And lastly, my "new" vintage 40's Kenmore has been named Judy - my boss was super cool about helping me haul the machine to my house (it's in a cabinet) so with his permission I named the machine after his late mother.
I have a couple other non-working machines that I picked up cheap because they looked like the machines my grandmothers sewed on; but since they don't work they don't get names. Lazy machines don't get names! LOL