My FW is named "Millie" because it seemed appropriate for a machine born in 1948. My Janome Jem Platinum is "Opal", the Brother machine is just Brother, and my Kenmore I've recently named "Mr Ken More", since it's an old work horse and doesn't deserve a feminine name. I got it in the 70's and it weighs a ton. That's why I bought Brother.
My PE-770 embroider machine doesn't have a name. I never thought about naming it.