Have I been hacked (strange terminal)

[jankees]

I noticed some strange thing today when i'm connected to the internet my terminal says:

Willem:~ jankees$
instead of
jankees-van-woeziks-macbook:~ jankees$

Does anyone know how this is posible? The strangest thing is, when i pull my networkcable from my macbook and then open a new terminal window the right name apears (jankees-van-woeziks-macbook:~ jankees$)...

I hope someone know more about this...

Kind regards,

 

[jankees]

update: I notice when i'm connect to the internet wireless i don't see those spooky terminals....

 

[fwhh]

Maybe the DHCP Server assigns a name for your computer? Does this also happens with DHCP turned off?
In Terminal type

ipconfig getpacket en0

and check if the new computername appears there... en0 shoud be the Ethernet wired connected, en1 should be the airport link.