Unknown PC icon showing up in the shared drop down menu - a hacker?

There is an unknown PC "kirkshp" showing up in the shared drop down menu, that makes me worried. I have shut off my bluetooth, and airport connection for now but would like to know how this PC is connecting and how to eliminate this in the future.
Have seen many posts with this problem, but not a comparable situation as I don't even have wireless router in house - I am hooked in via ethernet but use airport when out of my studio.
Just want a simple, if temporary solution until I can learn more about network security - any wisdom out there? I would so appreciate it, thanks!

I think by Shared you mean the Shared Section in the Finder Window's Sidebar. If that's the case what you're seeing is probably because
(1) either you've joined an unsecured wireless network or
(2) your wireless network is unsecured and that person has joined your network
(3) both of you are using a freely available public wireless network
(4) your network is secured but has a weak password
(5) your network is secured with a password which has been broken
(6) your network is secured but you've given the user you're seeing the password
If (4) and (5) is the case change the password. If (6) perhaps you've forgetten? Perhaps the PC you're 'seeing' is named in a way you don't recognize as the person you gave the password to?
If (2) force users to require a password to join your network or disable the option that broadcasts your wireless network's name. That way no-one 'sees' your wireless network 'announcing' itself as such. The only way to join the network would be to manually enter its name which you would have to know in the first place. You do this using your gateway/router's web interface. Assuming your gateway/router supports this option?
If (1) you're probably looking at the person's PC whom the network belongs to.
As long as you don't enable Personal File Sharing, unrestricted SSH access or VNC then at best all they can do is 'see' another PC that happens to be connected to the same network. If you have enabled Personal File Sharing 'beef' up your passwords and begin to restrict which user/account is allowed access to Public Folders. Can you actually connect to that PC? Or is all you can do is 'see' it?
I actually don't see any of this as a 'problem'. For me this is how this part of the OS is supposed to work. Macs announce/broadcast themselves on P2P Networks using a variety of protocols - Bonjour/Rendezvous, NetBios etc. PCs do something similar. You may also find the PC that you can 'see' is not actually a PC but a Router/Gateway/Firewall. Some Thompson Gateways for example broadcast themselves as a 'PC'.

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