Mine are named after women in my family.
Babylock Ellegante is Irene after my paternal grandmother because they both think they are kind of fancy but work had when need be.
Janome 6600 is Lula (Lu for short) after my Mammaw because she is a workhorse.
My Singer 301 is Ida after my husband's Tante Ida. I loved that woman dearly and there was nothing in the way of needle work she couldn't do.
The FW is Emma after my great grandmother.
The treadle is Aggie after my DIL's grandmother because it was her machine.
I haven't stuck with a name for the 99K but I lean towards Maimie. That was my great grandmother's name and she was a very strong woman.
I will have to come up with other names for anymore machines because all the others I know are names my family currently has, like Sarah, for instance.