Mac changed its own Name

New MacBookPro named "H-1-111-XX"
Connected it via wireless to our business network.
We do not run OD (OSX server yet)
This Mac was not bound to AD

I however ran RDP for Mac (from Mactopia) and RDPed in to several of our servers (not AD)

Later in the same day (first day) I noticed that the name in the Terminal was not the same name as in sys pref/Shared

The Mac changed the name from "H-1-111-XX" to "H-LT-OKAP"
In Sys Pref/Shared the name was still H-1-111-XX but at the same time the Terminal said it was H-LT-OKAP

The H-LT-OKAP is not a random name. It is a name from an old windows laptop which has been off the domain for over a year. However this name "H-LT-OKAP" is still in our AD and that is where the Mac got it from.

Any idea of why or how did the Mac change its name?

Cheers
Yev