How can I stop my Linux machine from broadcasting its name on the network?

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http://unix.stackexchange.com – I have a Linksys router and I've noticed that when I look for connected PC's on the router, the name of my computer and MAC address of the wireless device appears. However, I've noticed that for some devices it appears only the device MAC address, without a name. For example, Apple computers connected to the router appear without a name. The PlayStation 3 and the printer appears without a name too. So my question is, how can I stop my PC with Linux from broadcasting its name so the router can only present its MAC address and not the name? I really don't have any share utility so I don't (HowTos)