At my first job/internship it was fish names (they were dev/qa servers so wiped almost daily): Crappie, Bluegill, Walleye, Marlin, etc.
Current job is medical so it's all professional (i.e gr01sec02, gr02sccm01)
At home I've got a couple of naming schemes for different device types.:
Phones: i-telleuwat(last 4 of the number)
PCs and Media centers: playon(last octet of the IP)
Servers:gimme(service thats hosted)