What do you mean by "device"? A device is a peice of hardware, how do you know it's named Naomi? Maybe you mean something else? Need some more details here. Where on the computer did this thing show up? Are you talking about in Network Neighborhood? Are you behind a router or connected directly to the modem? If you don't have a router, get one, will help keep your PC secure.
de·vice [ di vss ]
tool or machine: a tool or machine designed to perform a particular task or function
ploy: a way of achieving something, especially a clever or dishonest way
explosive object: a bomb or something that causes an explosion or fire
Synonyms: machine, tool, piece of equipment, mechanism, apparatus, appliance, gadget,