Don't overload other terms already in common use.
Eg: up, down
Don't choose a name after a project unique to that machine.
Eg: shop
Don't use your own name.
Eg: don
Don't use long names.
Eg: slientdarkrider
Avoid alternate spellings.
Eg: czek
Avoid domain names.
Eg: kracekumar.com
Don't use antagonistic or otherwise embarrassing names.
Eg: moron
Don't use digits at the beginning of the name.
Eg: 127home
Don't use non-alphanumeric characters in a name.
Eg: db$
Don't expect case to be preserved.
Use words/names that are rarely used.
Eg: squire
Use theme names.
Use real words.
There is always room for an exception.