Most obscure the name the easier it is to spot that it is dodgy. Who has looked at their Task Manager in Windows and the processes tab and noticed weird processes running? Yeah the weirder the name the higher the possibility it is not right.
The worse kind are the ones that run silently and each time you run an executable file or .com (if on an older windows) file it will infect it so each time you run that it will be back again, it makes removal very difficult. And of course the self replicating types that randomly reassign a new file name every so many seconds and saves itself to the HDD and rewrites the registry, this makes it impossible to delete entries from the registry and kill the processes before a new one is made, eventually your HDD is full of little .dll files :P
I have seen kinds like that. They are a huge pain to get rid off and can take a very long time to find and destroy. Even with the most top-notch AV software it can still be a chore.