nethood unrecognized users

Could my notebook be establishing "users" from a wireless connection if the machine is left on in my vehicle in an area where it is possible for a connection to someone else's wireless router. I am seeing in a folder marked "Nethood" someone elses name and I've got that same name identifying a printer on my network. Seems like my computer did this without me knowing it or did someone hack my machine?

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RHK BUILDERS
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