Another caller says his "computer name" is locked. What he means is his login ID.
A third, when asked for an IP address, proceeds to rattle off his phone number. When told how to get his IP, he reads off his MAC address.
These people speak English as a first language (ah, trusty dialects!) and there does not seem to be a problem with the phone system. I feel like I'm in a Twilight Zone episode.
What's the worst mis-naming you've seen?
EDIT: I almost forgot: one coworker asked me when she was going to get "one of them flat-tops". She meant an LCD monitor.