I used to have them numbered:
Primus
Secundus
Tertius
After Quaternius, I decided that enough was enough. Eventually they all died, one way or another, though Secundus' OS drive has been resurrected for a while.
Now each family member has their own laptop and they are named appropriately, and I have a beater laptop I use for testing purposes, called Red Shirt.
My peripherals are all named after mythical beasts.