My Featherweight is Patsy Cline, because she's a real singer.
I have a treadle named Doris (after her original owner).
I also have an older Singer that I call Bernice (after her original owner).
My Viking is called Victor or Victoria - depending upon what mode he/she is in.
My serger is Sergio.

I've downsized and sold several so the others are currently nameless.