How do I change my computer name?

My computer is being assigned a new name by the operating system. A window opens stating that this computer is already being used on the network and a new name is automatically assigned. For example, my computer name is drp-mbp and then it is assigned the name drp-mbp(1). Why is this happening and how can I change the name back to what it was?
Thank you.

It would appear that you either have other devices on your network using the same Computer Name, or the system has messed up and "thinks" it has found another device with the same name. See this discussion: Computer name keeps changing.: Apple Support Communities.
Also:
Mac OS X will automatically increment the computer name when it thinks there are duplicate names on the local network. are your other devices also seeing all these different ghost iMacs on the network?
what is your network setup? what/where is the main router? and how many routers do you have? is only one router doing DHCP duties?
it's possible that your iMac is being served multiple IP addresses and therefore appears multiple times on network. alternatively you might have some static IP addresses set up that are conflicting with your DHCP setup.
btw, the free version of IP Scanner will show you up to 6 devices. if you don't want to buy a licence, you can simply keep hitting the rescan button to try and get a different combination of devices shown: http://10base-t.com/macintosh-software/ip-scanner
Do you have more than one router in your network?

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Thanks Eric. I note a few differences though.
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